It's a vacuum in the video. The water vapor is being removed by the pump as fast as it boils. If it wasn't, it would stop being a vacuum.

>Your skin and sweat equalise in temperature until the sweat evaporates or is wicked away.

That doesn't even make sense. Your sweat literally comes from your body. It starts at the exact same temperature as your body. It can't take warmth from your body until it's the same temperature as the rest of your body since it was already at body temperature to begin with.

Sweating is entirely a form of evaporative cooling. Even the wikipedia articles says as much.

Buy a bottle of canned air and spray it. You can feel the bottle cool down dramatically to the point where it can cause frostbite as the compressed liquid inside turns to vapor. To the point where the bottle will stop working if you run it for too long.

Take a cooler full of ice, place a thermometer in it, and add salt. Since the ice will melt without heat being added the water will drop in temperature dramatically compared to the ice you started with.

Here is a god damn youtube video of someone freezing water by boiling it in a vacuum.

This is literally how sweat works.

Entrophy isn't an issue because it would still take energy to revert to its original liquid form.

The process of boiling is endothermic, meaning the boiling water would rapidly cool without a source of heat. Which is probably what they're referring to.

>The actual danger of removing his helmet in the situation above is that it wouldn't solve the problem

Without pressure, wouldn't the water immediately boil away? There literally wouldn't be anything holding the bonds together anymore.

Rabies doesn't cause biting, per say. It causes increased levels of aggression, which translates to biting for most animals.

This is part of the reason why human to human transmission is so rare. When humans fight we rarely bite, so even if a person does get infected they're unlikely to spread the virus by biting.

And vice versa, yes. It's hard to distinguish these people, though, since they often don't know what asparagus pee smells like and have nothing to compare it to if they did smell it.

No problem. It's not just limited to asparagus pee too. Taste & Smell are exceptional in how much they vary from one person to another. A famous example is "phenylthiocarbamide". One person spilt some in a lab setting and was confused as to why everyone around him was talking about the smell.

Another example is how certain vegetables, such as spinach, taste terribly bitter to some people and perfectly fine to others. A common trope is a mother screaming at her son/daughter to eat their veggies while the dad sits quietly because he also hates spinach.

Mom lacks the genes which make them taste bad while the children and dad do. The kids aren't just being picky, they literally taste significantly differently between mother and child.

People's sense of smell & taste tend are known to be heavily dependent on genetic factors, but are super complicated. It's my understanding that these aren't determined by a single gene but the interactions between multiple genes. So they're poorly understood as a result. In general, smell and taste aren't something that gets determined by a single recessive or dominant gene.

For what determines excretion, I just don't know.

It's important to note that viruses don't actually want to kill their host. A dead or excessively sick host is less likely to spread the virus to the next person. So viruses generally evolve to make its host sick without killing them.

The issue is that bats have a much heartier immune system than humans do. So when a virus adapted to living in bats jumps to humans, it's waaaay too virulent for the human body. It's not that bat viruses are more likely to infect humans than a cow virus or some other animal. It's just a lot more likely to be deadly when it does.

Funnily enough, both the ability to smell asparagus pee AND whether or not your pee smells from asparagus is genetic.

Many people can't smell it, and many others don't have pee that smells. A lot of people don't produce a detectable smell after eating it, but the people who claim to smell it have been scientifically shown to agree on which samples smell and which do not. So it's not psychosomatic either.

Even if it works as intended, you're probably going to blink twice on occasion. Imagine driving and accidently blinking twice.

While large animals eat more, they also eat foods that themselves have higher concentrations of mercury.

Krill eat mercury, have tiny amounts of mercury. Small fish eats many krill, bioaccumulate all the mercury from the krill. Small fish has relatively much more mercury in them than krill.

Medium fish eats many small fish. Medium fish bioaccumulates mercury from many small fish, it has even higher concentrations of mercury.

Large fish eats medium fish.

We eat the large fish, which has A LOT of mercury in it. Many times more mercury than the small animals do.

So it's not just the matter of we need more mercury and we eat more mercury but we tend to eat animals which themselves have relatively high levels of mercury. Then live long lives, giving said mercury a lot of time to build up.

I guess it's a bit redundant with the top of the food chain line.

Yup, and humans are large, live extremely long lives (more time to accumulate), and are exist at the top-iest of the top of the food chain.