Throughout the day today, I thought often of previous Groundhog Days and the experiences and enlightenment that came with them. As Groundhog Day 2013 comes to an end, I find myself thinking about the passage of time. Experience teaches us a great deal about ourselves and, given the right circumstances and encouragement, when can grow and learn everyday.
I continue to value and appreciate the lessons of my own journey -- some of which I have reflected on in recent articles -- and I am hoping and planning an exciting year ahead. However, I am also careful to temper that excitement with the recognition that I would not be able to have such opportunity ahead nor the appreciation of my journey without being mindful of who I am in the present.
By the time this article publishes, I will be watching "Groundhog Day" (again). Like Phil, of the film, repeating the same day countless times while learning to improve himself, I hope to continue to embrace the beauty of each day -- even its familiarity -- and mold myself into the man I want to be in my continued journey. And while I value the significance of this year, for me, I recognize that time continues on and everyday brings with it new growth and opportunity.
2013-02-02
2013-01-10
More than the summit
Much of our psychology and sociology is dedicated to studying and preserving existence. Throughout history, it appears as if humanity is determined to derive some purpose for life. I, personally, have spent a great deal of time and much thought trying to seek purpose in my life. However, the singular search for purpose seems so futile and the results, if any, are flimsy and fleeting.
Before I elaborate, let's start by addressing "purpose". The basic principle in the purpose of existence is as simple as Shakespeare: to be or not to be. Our purpose is to sustain ourselves, sustain our species, and to sustain the existence of all life. Everything else we construct, both mentally and as a society, is external to that basic premise.
Some philosophers have argued that the constructs beyond those "basic needs" are meaningless, pointless, and unnecessary. There was a time when I thought that way as well. Now, it seems, I had the wrong idea and I needed to alter my perspective a bit to see things differently.
The change in my view came as part of a larger shift in my thought and attitude. In hindsight, I can see the first public indications of that shift in my article "A midsummer's hike":
So, what is it that we're really searching for in life? What is this internal drive that we all seem to feel at some point in our lives? Let's circle back to the idea that anything outside "purpose" is "meaningless". I would like to now argue in opposition. While those things necessary for sustaining existence are certainly essential, they are not substantial. And it is that substance that truly is "meaningful".
Reflecting on the shift I experienced during that hike and how it applies to the concepts of purpose and meaning, the relentless pursuit to achieve some goal (purpose) deadens the nuance (meaning) of the experience. It's foolish and dangerous to hike in ignorance of your environment, so too is it foolish to go through life without finding meaning in the experience.
As with the weather on a hike, it was an external influence that started the necessary change in my internal process and shifted my mindset. Had I not accepted that external influence, I may never have come to understand that while the basic essence of life defines what challenges we face in life, it is the substance in our lives that enriches how we approach those challenges. Sometimes things don't go as desired and you get rained on, but it would certainly be a less enjoyable experience if you wear your rain gear all the time.
The wonder of existence comes in finding the balance between preparing ourselves for the challenges while keeping our perspective open to the beauty. Do we push hard toward only one goal (e.g. the summit, the essence, to be or not to be), trampling both thorn and flower as we march? Or do we change our pace and shift our perspective, to better feel the substance (both painful and wonderful) of our existence?
Before I elaborate, let's start by addressing "purpose". The basic principle in the purpose of existence is as simple as Shakespeare: to be or not to be. Our purpose is to sustain ourselves, sustain our species, and to sustain the existence of all life. Everything else we construct, both mentally and as a society, is external to that basic premise.
Some philosophers have argued that the constructs beyond those "basic needs" are meaningless, pointless, and unnecessary. There was a time when I thought that way as well. Now, it seems, I had the wrong idea and I needed to alter my perspective a bit to see things differently.
The change in my view came as part of a larger shift in my thought and attitude. In hindsight, I can see the first public indications of that shift in my article "A midsummer's hike":
I love finding new and exciting experiences throughout the world, but I sometimes find myself pushing physically so hard toward some goal that I ignore what I'm feeling about the experience of getting there. I certainly enjoy the external aspects of the experience (e.g. beautiful views, incredible company, wondrous wildlife). I hope that this new approach to my pace will help me to be mindful of the internal experience as well.The hike that day was spectacular. Not only did that small change in approach impact my overall enjoyment, the subtle shift caused some of the ripples which would slowly change my attitude and approach to life from then on.
So, what is it that we're really searching for in life? What is this internal drive that we all seem to feel at some point in our lives? Let's circle back to the idea that anything outside "purpose" is "meaningless". I would like to now argue in opposition. While those things necessary for sustaining existence are certainly essential, they are not substantial. And it is that substance that truly is "meaningful".
Reflecting on the shift I experienced during that hike and how it applies to the concepts of purpose and meaning, the relentless pursuit to achieve some goal (purpose) deadens the nuance (meaning) of the experience. It's foolish and dangerous to hike in ignorance of your environment, so too is it foolish to go through life without finding meaning in the experience.
As with the weather on a hike, it was an external influence that started the necessary change in my internal process and shifted my mindset. Had I not accepted that external influence, I may never have come to understand that while the basic essence of life defines what challenges we face in life, it is the substance in our lives that enriches how we approach those challenges. Sometimes things don't go as desired and you get rained on, but it would certainly be a less enjoyable experience if you wear your rain gear all the time.
The wonder of existence comes in finding the balance between preparing ourselves for the challenges while keeping our perspective open to the beauty. Do we push hard toward only one goal (e.g. the summit, the essence, to be or not to be), trampling both thorn and flower as we march? Or do we change our pace and shift our perspective, to better feel the substance (both painful and wonderful) of our existence?
2012-10-05
Soaring through the stratosphere
The highest point on Earth is the summit of Mount Everest [wikipedia] at 8848 meters (29029 ft). The average cruising altitude of a commercial jet airplane is about a thousand meters higher at around 10000 m (≈33000 ft). On Monday, October 8th1 Tuesday, October 9th2 a date still to be determined3 Sunday, October 14th, Felix Baumgartner will step out of a specially designed capsule and freefall from over 37000 m (over 121000 ft). During his "Red Bull Stratos" jump, Felix will break quite a few records, including becoming the first person to pass the speed of sound (≈1200 km/hr) on a skydive.
In addition to the obvious awesome-factor, this event will hopefully aide in the advancement of space exploration. Felix will be wearing a "next generation" pressure suit, which might be useful to astronauts in future travels beyond our small planetary home. The detail of scientific data Felix's capsule and suit will gather will be helpful in the study of the atmosphere, spacecraft design, and the effects of such a "fall" on the human body.
As explained in this video [Red Bull Stratos], the whole event will be broadcast live by the Red Bull Stratos team in Roswell, New Mexico via 35 cameras. My appreciation of astronomy, high-adventure, and technology will certainly have me watching the broadcast with excitement. The path of our progress as a species was started with the single step of one person, a single step taken beyond the trail already made and supported by the people who walk by their side.
1 2012-10-06@07:00:00 MDT UPDATE: Mission postponed to 9 Oct, due to weather concerns.
2 2012-10-09@11:45:00 MDT UPDATE: Mission aborted during launch preparations due to wind conditions.
3 2012-10-09@13:00:00 MDT UPDATE: Next weather window appears to be 14 Oct.
In addition to the obvious awesome-factor, this event will hopefully aide in the advancement of space exploration. Felix will be wearing a "next generation" pressure suit, which might be useful to astronauts in future travels beyond our small planetary home. The detail of scientific data Felix's capsule and suit will gather will be helpful in the study of the atmosphere, spacecraft design, and the effects of such a "fall" on the human body.
As explained in this video [Red Bull Stratos], the whole event will be broadcast live by the Red Bull Stratos team in Roswell, New Mexico via 35 cameras. My appreciation of astronomy, high-adventure, and technology will certainly have me watching the broadcast with excitement. The path of our progress as a species was started with the single step of one person, a single step taken beyond the trail already made and supported by the people who walk by their side.
1 2012-10-06@07:00:00 MDT UPDATE: Mission postponed to 9 Oct, due to weather concerns.
2 2012-10-09@11:45:00 MDT UPDATE: Mission aborted during launch preparations due to wind conditions.
3 2012-10-09@13:00:00 MDT UPDATE: Next weather window appears to be 14 Oct.
2012-06-28
Getting a full slice of pie
Last year, I presented some information about the mathematical concept of "tau". Most importantly, I encouraged an educational focus toward the practical:
As I've said in some fashion in other articles:
Keeping the students as the priority, certain "weird math" gets discarded. For example, did you know that a full pi radian angle is only 180°. If I were to use only pi to cut you a slice of pie that means you would only get half of what you asked for because a circle is really 2π. Using τ you would have access to the full 360°.Today is again Tau Day and I would like to remind you to get that full slice of pie in your life. Use an open mind and the power of critical thinking to find the methods which expand your world-view.
As I've said in some fashion in other articles:
Never accept "because I said so"; find a better source, one which will help nurture your curiosity not belittle it. Explore the world around you, excite your mind with interest, accept the dynamic nature of "fact", and wonder at the beauty of information.Vi has put together another fun video [YouTube] about Tau this year. As she says in the silly fun of her song:
"We get further from truth when we obscure what we say."Tau is a simple and easy way to understand the math of circles. And, let's be honest, math is far to important to be overlooked because someone long ago decided to make it appear harder to conceptualize than it really is.
2012-06-20
A midsummer's hike
Ten minutes after this article publishes, the June solstice of 2012 will occur (2012-06-20@23:10 UTC). As written in my "Survive in extreme temperatures" article published at the last solstice (December):
This midsummer marks the start of my primary hiking season. In fact, by the time this (automatically) publishes, my girlfriend and I should be well on our way to the location of our hike. We are both avid hikers year-round, but I've found that I most enjoy tackling larger summits during the warmer months.
During this hike, I am hoping to try something new. I have a tendency to push myself to find and maintain a constant pace while hiking; essentially, forcing myself to march up mountains. This time, I'm going to experiment with strategically changing the pace based on incline.
If we encounter a flat area, I hope to push myself slightly beyond a comfortable pace. When we encounter an incline I hope to slow myself to a pace below my comfort. I'm curious to observe the results on my overall performance. My goal is to keep the focus on comfort, not time or destination.
I love finding new and exciting experiences throughout the world, but I sometimes find myself pushing physically so hard toward some goal that I ignore what I'm feeling about the experience of getting there. I certainly enjoy the external aspects of the experience (e.g. beautiful views, incredible company, wondrous wildlife). I hope that this new approach to my pace will help me to be mindful of the internal experience as well.
During a solstice, the "tilt" of the Earth is at its greatest angle in relation to its orbit around the Sun.For astronomers, today's solstice marks the start of Summer in the Northern hemisphere. As much as I love astronomy, I prefer to view the seasons as we do our days: When the Sun is at its peak during the day, we say it is midday. In the same way, when the Sun appears at its Northern most in the sky, it is midsummer.
This midsummer marks the start of my primary hiking season. In fact, by the time this (automatically) publishes, my girlfriend and I should be well on our way to the location of our hike. We are both avid hikers year-round, but I've found that I most enjoy tackling larger summits during the warmer months.
During this hike, I am hoping to try something new. I have a tendency to push myself to find and maintain a constant pace while hiking; essentially, forcing myself to march up mountains. This time, I'm going to experiment with strategically changing the pace based on incline.
If we encounter a flat area, I hope to push myself slightly beyond a comfortable pace. When we encounter an incline I hope to slow myself to a pace below my comfort. I'm curious to observe the results on my overall performance. My goal is to keep the focus on comfort, not time or destination.
I love finding new and exciting experiences throughout the world, but I sometimes find myself pushing physically so hard toward some goal that I ignore what I'm feeling about the experience of getting there. I certainly enjoy the external aspects of the experience (e.g. beautiful views, incredible company, wondrous wildlife). I hope that this new approach to my pace will help me to be mindful of the internal experience as well.
2012-06-18
Review: The Flinch
The Flinch by Julien Smith
My rating: 4 of 5 stars
The Flinch was an entertaining and enriching book and I am glad to have read it. I really enjoyed the light, fast-paced, and fun style of Julien Smith.
I have touched on the subject of fear in my blog and I had planned to circle back again to it again. The Flinch gave me some new inspiration, physiological experiments, and a different perspective for a familiar topic.
I enjoyed the book enough to devour its entire contents in one sitting. I like to imagine that Smith had originally written more, taking us further beyond the comfort of everyday, but the editors simply flinched.
View all my reviews
Review: The Total Money Makeover: A Proven Plan for Financial Fitness
The Total Money Makeover: A Proven Plan for Financial Fitness by Dave Ramsey
My rating: 2 of 5 stars
I have had a few financial struggles in my life, but I've learned some fantastic lessons from those challenging experiences. Dave Ramsey's book is a decent compilation of advice for those people who haven't yet learned those lessons for themselves.
Perhaps my view of The Total Money Makeover is the same as my view of any other "makeover". I don't think any "makeover" is really necessary, it suggests that a person is incapable of changing themselves without some external enhancements. In this case, the financial advice is great, but it's the knowledge that gives you the power. It's not the "stylist" that makes your hair or makeup great, it's you. Learn (without buying anything) how to do something, then do it.
View all my reviews
2012-06-14
How to estimate wind speed and direction
Today is Flag Day in the United States of America. Many countries have these "Flag Day" public holidays, during which the adoption of the national flag or a specific event is recognized. Flags can be found, in some form, throughout history, but their usefulness extends beyond identification, patriotism, and decoration. How? Well, the answer, my friend, is blowin' in the wind.
Source: "Palace of the Four Winds" - Wikipedia
It's easy to become so accustomed to our environment that we miss the nuanced information we can collect from it. I previously presented how to predict the weather using observations of your environment in my Survival Guide Series. Today, I would like to detail how you can use similar awareness to discern wind speed and direction, another useful survival skill.
There have been a small collection of measurement systems for estimating wind speed, effects, and direction developed throughout history; one of which is the Beaufort wind force scale [Wikipedia]. Initially used to qualitatively evaluate wind effects, the Beaufort scale was eventually made into a more useful measure of wind conditions.
The Wikipedia article on the Beaufort scale has a wonderfully comprehensive table of the measures and effects of wind at each stage of the scale. I’ve chosen to select specific qualities and quantities from that table to ease memorization. For example, you’ll find that I list specific easy-to-remember speeds approximately within each Beaufort scale, rather than just throw a bunch of data at you. After all, my goal with this article is to make this information easy for you to use without technology or calculation. I want to empower you to look at the world around you and instantly discern the information you desire.
I’ve divided my groupings into three types of observations: flags, land, and sea. The effects described for the flag, are based on a common midsize flag (2:3 ratio, about 1 m ≈ 3 ft on its shortest side). For land, I made sure to include observations of the trees; do keep in mind that other factors can also affect tree movement, such as weather and fauna (e.g. rain may make leaves move, snow may hinder branch motion, squirrels may shake small branches).
It’s easy to miss the wonders of the world around us, if we don’t first make an effort to look for them. I hope that the information within these guides inspires your enjoyment of our planet and makes the external environment feel more personally relevant.
Source: "Palace of the Four Winds" - Wikipedia
It's easy to become so accustomed to our environment that we miss the nuanced information we can collect from it. I previously presented how to predict the weather using observations of your environment in my Survival Guide Series. Today, I would like to detail how you can use similar awareness to discern wind speed and direction, another useful survival skill.
There have been a small collection of measurement systems for estimating wind speed, effects, and direction developed throughout history; one of which is the Beaufort wind force scale [Wikipedia]. Initially used to qualitatively evaluate wind effects, the Beaufort scale was eventually made into a more useful measure of wind conditions.
The Wikipedia article on the Beaufort scale has a wonderfully comprehensive table of the measures and effects of wind at each stage of the scale. I’ve chosen to select specific qualities and quantities from that table to ease memorization. For example, you’ll find that I list specific easy-to-remember speeds approximately within each Beaufort scale, rather than just throw a bunch of data at you. After all, my goal with this article is to make this information easy for you to use without technology or calculation. I want to empower you to look at the world around you and instantly discern the information you desire.
I’ve divided my groupings into three types of observations: flags, land, and sea. The effects described for the flag, are based on a common midsize flag (2:3 ratio, about 1 m ≈ 3 ft on its shortest side). For land, I made sure to include observations of the trees; do keep in mind that other factors can also affect tree movement, such as weather and fauna (e.g. rain may make leaves move, snow may hinder branch motion, squirrels may shake small branches).
CALMI know this list of observations seems long, but it can be fun to focus most on those qualities most commonly relevant to your daily life (Beaufort 2 - 8). In the days writing this article, I have found myself frequently looking out a window to observe, estimate, and check the wind speed.
Beaufort 0 - Less than 2 km/h (≈ 1.25 mi/hr)Flag: Flag is at rest.LIGHT AIR
Land: Smoke rises gradually straight up, with very little drifting.
Sea: The water’s surface will appear smooth and reflections will be clearly recognizable.
Beaufort 1 - 5 km/h (≈ 3 mi/hr)Flag: Flag moves slightly in the wind, the bottom corner of the flag will hang.LIGHT BREEZE
Land: Smoke will drift with the wind.
Sea: The surface of the water will show some rippling.
Beaufort 2 - 10 km/h (≈ 6 mi/hr)Flag: Flag extends in the wind, the top corner may flap and curl.GENTLE BREEZE
Land: Tree leaves begin to rustle.
Sea: Small waves begin forming. No curling or cresting.
Beaufort 3 - 20 km/h (≈ 12 mi/hr)Flag: Waves move across the fabric when the flag is extended in the wind.MODERATE BREEZE
Land: Leaves and small twigs will be constantly moving.
Sea: “Wavelets” form, crests begin to form and break.
Beaufort 4 - 30 km/h (≈ 20 mi/hr)Flag: Flag is in constant motion, flapping quickly in the wind.FRESH BREEZE
Land: Small tree branches begin to move. Dust and debris will be carried by the wind.
Sea: Small waves (up to 1 m high) begin to make longer curls. Crests become more numerous and easily visible.
Beaufort 5 - 40 km/h (≈ 25 mi/hr)Flag: Ripples move quickly across the fabric.STRONG BREEZE
Land: Small trees with leaves will begin to sway.
Sea: Moderate waves (1-2 m high) form. Many crests are visible, some surface spray is carried by the wind.
Beaufort 6 - 50 km/h (≈ 30 mi/hr)Flag: The flag will “snap” and “pop” as it waves, flaps, and ripples. Damage to the flag will begin to occur.NEAR GALE
Land: Larger tree branches will begin moving.
Sea: Large waves (2-4 m high) form. More spray is carried in the wind.
Beaufort 7 - 60 km/h (≈ 35 mi/hr)Flag: Flag will begin to tear, possibly detaching from its hoist.GALE
Land: Large trees begin to move and sway. Most people will feel some resistance when walking against the wind.
Sea: The surface of the water begins to heave. Sea heaps up, waves about 5 meters in height will form. Crests will spread down the waves from where the wave breaks.
Beaufort 8 - 75 km/h (≈ 45 mi/hr)Flag: What flag? If not already torn from its hoist, there will be little left of the flag to respond to the wind.STRONG GALE
Land: Loose leaves and small twigs break free of tree branches. Most people will have difficulty standing and/or staying balanced in the wind.
Sea: Moderately high waves (5-7 m) form. Spray from crests drifts (aka “spindrift”) across the surface with the wind.
Beaufort 9 - 88 km/h (≈ 55 mi/hr)Land: Large tree branches may break. Some damage to buildings.STORM
Sea: High waves (7-10 m) form. The whole surface begins to roll. Foam streaks across the surface. Spray carried in the wind notably fills the air.
Beaufort 10 - 100 km/h (≈ 65 mi/hr)Land: Tree trunks may break and/or whole trees will uproot. Significant damage to buildings. (Wind of this speed is a rare occurrence on land.)VIOLENT STORM
Sea: Very high waves (10-12 m) with large crests. The surface is dense with foam and rolls deeply. Visibility is hindered more by spray in the air.
Beaufort 11 - 115 km/h (≈ 70 mi/hr)Sea: Waves nearly 15 meters in height. The surface of the water is mostly foam.HURRICANE
Beaufort 12 - Greater than 115 km/h (≈ 70 mi/hr)Sea: The air is now filled with foam and spray. Waves are over 15 meters high and the surface of the water is completely white with foam and spray.
It’s easy to miss the wonders of the world around us, if we don’t first make an effort to look for them. I hope that the information within these guides inspires your enjoyment of our planet and makes the external environment feel more personally relevant.
2012-06-06
Venus between us
The past month has been filled with wondrous astronomical viewing events: a lunar perigee, a solar eclipse (during the lunar apogee), a partial lunar eclipse, and yesterday's transit of Venus across the Sun. I've written about astronomy events in the past, such as the lunar perigee of March 2011 and the lunar eclipse of December 2011, so it should come as no surprise that I was thoroughly enjoying these recent events.
Sometimes the sky conditions at my location made viewing of an event less than ideal, but I have learned to make the viewing experience, not the sight itself, the focal point of my excitement. For example, during the recent solar eclipse, I put my focus on creating a fun and memorable experience for my daughter; hopefully, a life-lasting memory of the first time she watched a solar eclipse. We talked about what was happening, how it was happening, used different tools and techniques to safely observe the eclipse, and -- when the clouds rolled in -- we enjoyed the spectacle of a cloud's "golden" lining.
The planets of the solar system, including Earth, all orbit around the Sun. Sometimes the planets orbiting closer to the Sun than us pass directly in front of the Sun from our perspective here on Earth. Yesterday, a once-in-a-lifetime event took place when Venus passed through such a perspective. Many people again turned their eyes toward the skies -- hopefully, with proper eye-protection -- to watch our nearest neighbor move across our view of the Sun.
With a planet of 7 billion humans, I knew from the start that the event would be documented and shared [NASA + YouTube] by many. So, I enriched my experience of this event, making it unique and memorable in my own way. I borrowed a friend's welding mask -- making sure it was an appropriate shade rating -- to watch the transit of Venus. At times, clouds blocked my view of the Sun, but I had my computer close at hand with a Universe Today live webcast of views from areas where the sky was clear. As the Sun set, ending the viewing for my area, I took a special photo of the Sun (and Venus) as they set nearby Horsetooth Rock (a local landmark).
Photo taken by Indy in Fort Collins, Colorado.
There will be many more astronomical events throughout my lifetime, but it will not be until 2117 that Venus will again pass directly between Earth and the Sun. Personally, I am happy that I have been able to make these recent experiences fun and memorable for myself and those closest to me. Life is full of opportunity, some we take and some we miss. Like the "golden lining" of the cloud that my daughter and I marveled at during the solar eclipse, it's how you embrace an experience that defines your memory of it.
Sometimes the sky conditions at my location made viewing of an event less than ideal, but I have learned to make the viewing experience, not the sight itself, the focal point of my excitement. For example, during the recent solar eclipse, I put my focus on creating a fun and memorable experience for my daughter; hopefully, a life-lasting memory of the first time she watched a solar eclipse. We talked about what was happening, how it was happening, used different tools and techniques to safely observe the eclipse, and -- when the clouds rolled in -- we enjoyed the spectacle of a cloud's "golden" lining.
The planets of the solar system, including Earth, all orbit around the Sun. Sometimes the planets orbiting closer to the Sun than us pass directly in front of the Sun from our perspective here on Earth. Yesterday, a once-in-a-lifetime event took place when Venus passed through such a perspective. Many people again turned their eyes toward the skies -- hopefully, with proper eye-protection -- to watch our nearest neighbor move across our view of the Sun.
With a planet of 7 billion humans, I knew from the start that the event would be documented and shared [NASA + YouTube] by many. So, I enriched my experience of this event, making it unique and memorable in my own way. I borrowed a friend's welding mask -- making sure it was an appropriate shade rating -- to watch the transit of Venus. At times, clouds blocked my view of the Sun, but I had my computer close at hand with a Universe Today live webcast of views from areas where the sky was clear. As the Sun set, ending the viewing for my area, I took a special photo of the Sun (and Venus) as they set nearby Horsetooth Rock (a local landmark).
Photo taken by Indy in Fort Collins, Colorado.
There will be many more astronomical events throughout my lifetime, but it will not be until 2117 that Venus will again pass directly between Earth and the Sun. Personally, I am happy that I have been able to make these recent experiences fun and memorable for myself and those closest to me. Life is full of opportunity, some we take and some we miss. Like the "golden lining" of the cloud that my daughter and I marveled at during the solar eclipse, it's how you embrace an experience that defines your memory of it.
2012-06-03
Reapplying the sunscreen
My recent article about sunscreen contained a lot information on the light spectrum of the Sun and what radiation reaches the surface of our planet. The last bits of my article were dedicated to the choice and application of sunscreen. Those last bits were inspired by a graphic ["The Sunscreen Smokescreen" - Information is Beautiful] I encountered last Summer on one of my favorite data visualization blogs.
Like my blog, the graphic contains a lot of data, but it's an abundance of sunscreen data whereas my blog spent more time on light spectrum. So, if you want to "reapply" more sunscreen knowledge to your brain, check out the graphic below:
Like my blog, the graphic contains a lot of data, but it's an abundance of sunscreen data whereas my blog spent more time on light spectrum. So, if you want to "reapply" more sunscreen knowledge to your brain, check out the graphic below:
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