You can have a localized HVAC system that uses chilled water…?

You are correct with your idea of more air = more consistent air temperature / smaller temperature swings….but your explanation is a little off

There are other reasons beyond HVAC such as sound, lighting, room for large signage, and just overall aesthetics.

A better way to phrase it might be...why oxygen instead of Sulfur or Selenium? Because those are both in the same column on the Periodic Table, they have the same number of valence electrons and therefore can form double-bonds easily. However, the obvious answer comes to mind at the same time: they're both solid at room temperature. So...maybe...in a higher temperature environment, it might be possible for life to selectively choose gaseous Sulfur over Oxygen. But that's not how things work on Earth (most of the time)

More like 40-50 years, and a lot of this also has to do with how easy/cheap things are too manufacture. But in two words: Volumetric Efficiency. Engines are just giant air pumps. You cram more air in each cylinder per cycle, and you've effectively driven more air through the pump. Air moving = energy (because air has mass and thermal properties).

The higher the cylinder pressure, the more fuel & air you've crammed into the cylinder, the more power you make per ignition.

The biggest factor in our ability to manufacture cheap, high-pressure engines is: Metallurgy. Metals have made leaps and bounds in the past 30 years, and where once you needed expensive iron closed-deck blocks to eke out big cylinder pressure, you can now more easily do with carefully-designed, precision-machined aluminum blocks that weigh less, have better thermal properties, more homogeneous crystalline structure (stiffer), and thus can manage higher cylinder pressures (more boost).

Unless, of course, the enemy has come for dat ass.

>This results in a free hydrogen, which is pushed through some protein machinery to force a phosphate group onto adinosine diphosphate, creating adisonine triphosphate, otherwise known at ATP.

Ah the electron transport chain. It also binds leftover hydrogen atoms to oxygen make water as well right?

A lot of really good answers already. One thing I didn't see mentioned is you may also see videos from geostationary orbits which would make it look like the earth isn't rotating at all (though if you pay attention you'll notice space is "rotating" behind it). Could be messing with your perception depending on the context.

Because then you'd have countries changing from Monday into Tuesday in the middle of their day. It would be painfully confusing to everyone except the blessed few who get to live in the "correct" time zone. Most people live most of their lives locally. Your day is aligned with when you wake up, go to sleep, etc. and where the sun is in relation to where you are is more important.

Plus, having sensory organs close to the brain reduces the distance those inputs have to travel. Nervous signals are fast but they do take measure able amounts of time based on how far they must travel. When fractions of a second can mean life and death, getting all the info to your brain quickly means you’re likely to live longer than your butt-eyed peers.

I would think it has to do with keeping a stable climate during surges and lulls of people. Similar to how it’s easier to maintain water quality in a large aquarium s a smaller tank, more air volume will remain a steady temperature/quality.

I have nothing to back this up. Just a hunch.

The thing is, at first they didn't bother trying not to kill each other. The earliest tournies were just a bunch of bored knights gathering on either side of a field and then going at it. Blunted swords were an innovation! In a weird way it was like auto racing. At first nobody gave a sh- about safety. Then people realized it was a way to make money, and they started making it safer. And each step was a real innovation. They had to think up blunting lances, making them frangible, if you're never getting off the horse make that armor as thick as you can, and so on.

I was coming to ask this exact question lol... What about in the winter? That's wild!

Think of it like plumbing in a house. Generally most faucets and fixtures are close to each other to save on resources. Sure sometimes things get branched out as necessary but why bother moving the eyes down to the butt unless the majority of some hypothetical sexual deviant species really got off on Butt-eyes.

Perhaps the video is being taken from a geosynchronous orbit? Or a still photograph?

There are more things at work here. Muscle and skin cells behave differently than, say, organ tissue. [Jack LaLanne](http://Jack LaLanne) lived to be 96.

K, so its all about the second thing.

I build server rooms... they produce heat like 1000 people smashed into a black hole.. we push cooling through the floor.. high ceilings are telling everyone how happy they are about spending $500 on a 2 hour flight with no service.

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It doesn’t!

The first life on earth was anaerobic- it metabolized without oxygen. The evolution of oxygen producing life (photosynthesis) was disastrous for these early life forms and almost all of them were wiped out by the emergence of an oxygen rich atmosphere that was highly toxic to them.

We still have some life that can survive via anaerobic metabolism - for example Botulism can metabolize aerobically when there is oxygen available or anaerobically when there isn’t. For us the second path is terrible because it produces highly deadly (to us) chemicals in poorly preserved food.

Another, very well known, life form that uses anaerobic respiration area yeasts. In oxygen free environments they anaerobically metabolize sugars into alcohol and carbon dioxide. This is how we make all alcoholic beverages, and get bubbles in them!

Humans can, for a very limited time, metabolize anaerobically - typically for very short bursts of time when oxygen transport systems are unable to keep up with as very high intensity demand, like a 200 yard sprint. The byproducts of this are harmful to us though so our bodies will fairly promptly slam on the brakes and cause your muscles to seize up and force you to stop.

Anyway - why is oxygen such a preferred metabolic option? It enables a much more efficient production of energy than anaerobic options that we are aware of, and can output much higher energy - so lifeforms that we’re able to adapt and use it were able to do outperform any that weren’t.

Water cools the skin down and reduces the temperature of the burned area. Cold or hot water can cause further damage to the injured skin. Room temperature water is best since it will reduce risk of heat damage or frostbite.

Migraines are caused by something happening inside the brain; the exact cause is still being researched. But the fact that it is inside the brain (an organ without any direct pain sensors) means that the pain caused by the migraine is not directly sensed in the location of the cause.

It also means that the side effects of a migraine are much more than just pain. Scintillating scotomas, tingling in limbs not explained by it 'falling asleep', nausea, emotional and mental confusion, sensitivity to sounds or scents or lights, these are all common enough. And for some migraines, the side effects are more hindering than the pain.

If you have a killer headache and no other symptoms, you have a killer headache. There's a chance it's a migraine (the chance is greater because it's on one side of your head edit: the fading of the pain in a few hours to a day are also a migraine symptom), but it can be any number of things; consult a doctor for advice. Now, if you have (or had in the last 12 hours) one or more of the other symptoms (the exact ones are different person to person and migraine to migraine) it's probably a migraine and you can treat it with that assumption (migraine pills are a combination of other OTC pain medications).

TLDR: migraines are a headache plus a bunch of side effects, while a headache is just pain that feels like it is coming from your head.

That's something I actually forgot to consider. Being able to cook food and using tools to break bones and to cook and eat marrow and stuff helped advance us significantly. I've often wondered what species, if any, would become the next super intelligent earthican and it is interesting to think of it soley in terms of ease of nutritional resources. That being said, there aren't a whole lot of candidates. Thanks for the brain food friendo :)

The Allison V-1710 aka the engine in the p38 lighting, thats a airplane from WWII, makes about 1600hp with 28 liters of displacement and two huge superchargers. The Bugatti Chiron does the same with a 8 liter engine.

By today's standards WWII airplane engines are incredibly weak for their displacement.

Some tournament armours were so heavy there would be often two people helping the rider get onto a poor horse.

Anything that gets launched into space is already going at least the same speed as the Earth's rotation. It's not like it gets to space and then just slows down on its own. If anything it might be going faster than the Earth is rotating.

That's oddly comforting, she's not going to screw up so it's up to you to survive or not.

Nitrogen in its most common form N2 is very stable the triple bond between the two atoms takes a lot of energy to break. Compared to O2 which only has a double bond between them meaning it's much more reactive.

Both nitrogen and oxygen are necessary for life, but they have different chemical properties that mean they'll be used in different ways.