The Wise Book of Whys by Daven Hiskey, Today I Found Out.com Page B
Authors: Daven Hiskey, Today I Found Out.com
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their heads as short as most people’s anagen phases for their arms and legs. For these people, their hair never naturally grows more than a few inches long. The opposite is also true for people whose anagen phase can last decades for their scalp hair.
At any given time about 85 to 90 percent of your hair is in the anagen phase, 1 to 2 percent is in the catagen phase, and 10 to 14 percent is in the telogen phase. However, extreme stress can trigger the anagen phase to stop prematurely and hair can rapidly progress to the telogen phase, even as much as 70% of the hair on your body. When this happens, the majority of your hair that should still be growing can fall out all at once.
Under normal circumstances, though, you can get a rough estimate of how long your anagen phase is based on how long your hair gr ows naturally without cutting off a given area. First, assuming your hair isn’t already as long as it can get, measure your hair length, then exactly a month later measure it again and note the difference. Now you have your growth rate (usually about 1 centimeter every 28 days or 1 inch every 71 days). So if, without cutting, the hair on your head eventually grows 16 inches long max, then your anagen phase lasts: (inches*period per inch). So using the average of 1 inch every 71 days, (16 inches * 71 days/inch) = approximately 1,136 days or 3.11 years.
As to why when you cut hair, it will always grow back to its maximum length, this is just because when the cycle restarts, new hair comes in that can grow to the maximum length, eventually replacing the old hair that will be shorter than it could have been because you cut it.
As you might have guessed from the fact that hair growth is completely controlled by what’s going on under the surface, within your hair follicles, and that genetics and hormones are the primary things determining hair growth length, which are in no way affected by shaving, shaving does not in any way alter your hair growth rate, nor does it alter the color of the hair, contrary to popular belief.
Why Rice Krispies “Snap, Crackle, and Pop”
The popping is a result of the walls of the Rice Krispies kernels fracturing. There are two prevalent theories as to the exact process that results in this fracturing, and it’s entirely possible that both are occurring.
Rice Krispies, also known as “Rice Bubbles ,” in some countries, are created by preparing rice in such a way that it will “pop” like popcorn during the cooking process, albeit much less dramatically. This popping puffs up the kernels. When the rice is finished cooking, most of the Rice Krispies will have thin solid walls with hollow, sealed, areas inside where air pockets have formed.
In the first theory of what causes the fracturing of the walls, the sudden temperature shift caused by adding cold milk to the Rice Krispies causes the air inside the hollow pockets to contract suddenly, which, in turn, fractures the thin walls of the Rice Krispies, creating the noises.
The second theory also involves the fracturing of the thin walls, but by a different mechanism. The thin walls of the Rice Krispies have very strong bon ds between the starch molecules due to the high heat the Rice Krispies were prepared at. When you add cold milk, the sudden shift of temperature puts a high amount of stress on these bonds, due to uneven absorption. This is actually the exact same thing that happens when you pour hot water over a frozen windshield. This dramatic temperature shift causes both the glass in the windshield and the walls of the Rice Krispies to shatter.
BONUS FACT
While Rice Krispies are puffed by preparing the kernels with steam to provide the necessary moisture to the kernels to properly “pop” them, other methods to puff up rice, corn, wheat, etc. are also possible. The most popular alternative method is called “gun
At any given time about 85 to 90 percent of your hair is in the anagen phase, 1 to 2 percent is in the catagen phase, and 10 to 14 percent is in the telogen phase. However, extreme stress can trigger the anagen phase to stop prematurely and hair can rapidly progress to the telogen phase, even as much as 70% of the hair on your body. When this happens, the majority of your hair that should still be growing can fall out all at once.
Under normal circumstances, though, you can get a rough estimate of how long your anagen phase is based on how long your hair gr ows naturally without cutting off a given area. First, assuming your hair isn’t already as long as it can get, measure your hair length, then exactly a month later measure it again and note the difference. Now you have your growth rate (usually about 1 centimeter every 28 days or 1 inch every 71 days). So if, without cutting, the hair on your head eventually grows 16 inches long max, then your anagen phase lasts: (inches*period per inch). So using the average of 1 inch every 71 days, (16 inches * 71 days/inch) = approximately 1,136 days or 3.11 years.
As to why when you cut hair, it will always grow back to its maximum length, this is just because when the cycle restarts, new hair comes in that can grow to the maximum length, eventually replacing the old hair that will be shorter than it could have been because you cut it.
As you might have guessed from the fact that hair growth is completely controlled by what’s going on under the surface, within your hair follicles, and that genetics and hormones are the primary things determining hair growth length, which are in no way affected by shaving, shaving does not in any way alter your hair growth rate, nor does it alter the color of the hair, contrary to popular belief.
Why Rice Krispies “Snap, Crackle, and Pop”
The popping is a result of the walls of the Rice Krispies kernels fracturing. There are two prevalent theories as to the exact process that results in this fracturing, and it’s entirely possible that both are occurring.
Rice Krispies, also known as “Rice Bubbles ,” in some countries, are created by preparing rice in such a way that it will “pop” like popcorn during the cooking process, albeit much less dramatically. This popping puffs up the kernels. When the rice is finished cooking, most of the Rice Krispies will have thin solid walls with hollow, sealed, areas inside where air pockets have formed.
In the first theory of what causes the fracturing of the walls, the sudden temperature shift caused by adding cold milk to the Rice Krispies causes the air inside the hollow pockets to contract suddenly, which, in turn, fractures the thin walls of the Rice Krispies, creating the noises.
The second theory also involves the fracturing of the thin walls, but by a different mechanism. The thin walls of the Rice Krispies have very strong bon ds between the starch molecules due to the high heat the Rice Krispies were prepared at. When you add cold milk, the sudden shift of temperature puts a high amount of stress on these bonds, due to uneven absorption. This is actually the exact same thing that happens when you pour hot water over a frozen windshield. This dramatic temperature shift causes both the glass in the windshield and the walls of the Rice Krispies to shatter.
BONUS FACT
While Rice Krispies are puffed by preparing the kernels with steam to provide the necessary moisture to the kernels to properly “pop” them, other methods to puff up rice, corn, wheat, etc. are also possible. The most popular alternative method is called “gun
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