Comments by "Keit Hammleter" (@keithammleter3824) on "Institute of Human Anatomy" channel.

  1. He implied rigor mortis isn't that strong. You could have fooled me. I grew up on a farm - we had goats. One of our goats died in the middle of summer. I was 14. I had to bury it but father was away and he had hidden the keys to the tractor. I set to work with a pick and shovel, and after 4 hours or so and several litres of water drunk, I had managed to make a deep enough goat sized hole. But its legs and head stuck out in rigor mortis so I couldn't get it in the hole. I couldn't bend its legs and neck so I chopped them off with an axe.
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  2. Unless you can put numbers on it, like how many minutes sun exposure you actually need per day, for given amounts of skin uncovered by clothing, there is no point in teaching it - it's in practice meaningless. Especially when school kids are strongly taught that sun exposure leads to skin cancer and they must be fully covered or covered in UV blocking cream at all times in the sun. How do you expect them to resolve this dilemma when even doctors don't know.
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  3. The explanation given in this video, essentially that our butts are big because we need a big butt muscle to keep us upright, cannot be any more than part of the story. This is because butt size is clearly a secondary sex characteristic - women have much larger butts than men. Here's an interesting thing: My wife always had a sexy nicely curved butt. At age 60 she was diagnosed with breast cancer. As was standard for breast cancer, she was prescribed an estrogen agonist drug, as the most common forms of breast cancer thrives on estrogen. This caused 2 changes: a) she grew chin whiskers and had to shave, and b) she lost her nicely curved femaley butt - it shrunk down to boy size. Since she maintained her exercise level (her job entailed continually getting up from her desk and walking around her shop), that cannot be due to a reduction in muscle mass - it must be a loss of butt fat. So why do women have big butts compared to men, that is, why is it a secondary sex characteristic? It seems likely because humans have always worn clothes, but only recently on an evolutionary scale has it changed from loose fitting animal skins to form-fitted cloth. Therefore humans evolved at a time when how you could tell who was a woman and who was a boy needed to be a lot more obvious. Here's another thing: after her butt shrunk down, she for the first time found that sitting on a hard bench uncomfortable. Thus the thick adipose fat in both men and women protects the muscle when we sit - another reason for our large butts.
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  4. At the end you say you have covered everything. Nope. You missed out the most important item of information - just how much sun is needed. Here in Australia at least, doctors are taught that a lack of Vit D is just about impossible, due to our high ultraviolet levels from the sun - that's what they commonly tell patients anyway. But campaigns warning about skin cancer are run all the time. What would be of practical use would be to know just how much sun is needed to get sufficient Vit D. If only your arms are uncovered, how long in the sun do you need to be? If your legs are uncovered, presumably you need less time to make sufficient Vit D due to much greater exposed area. Is this in fact so? What if I spend 5 minutes in the sun, or 10 minutes, or 20 minutes? Is Vit D production directly proportional to exposure time, or is there a law of diminishing returns? Does Vit D production start instantly, or does the process take time to get going? How much time does it take to get going? Does 5 separate periods of 5 minutes in the sun make as much Vit D as one 25 minute session in the sun? Does Vid D production rise linearly with ultraviolet intensity, or is it power or sub-power relationship? Presumably production depends on skin temperature, as most biological reactions double in speed for each 10 C rise in temperature. Is skin temperature in practice a factor? Unless you can answer these questions, talking about getting Vit D from the sun is completely pointless. About as pointless as saying money brings happiness. How long is a piece of string?
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