Checking to make sure the tail doesn't have anything stuck to it, isn't encumbered, isn't suddenly missing a bunch of fur.

Oh, well right, he's just stating one example of the conservation of energy.

Steam, solar, electrical, geothermal, wind… all of these power sources are practical and reliable.

His point is that the energy doesn’t come from gravitational force, but from (in that case) solar energy, as the water was lifted out of the ocean and dumped on mountains via solar thermal energy. Gravity is zero-sum.

However, this still misses the point that ALL energy is zero-sum — energy cannot be created or destroyed, only transformed. Once deposited on a mountain, gravitational force overcomes solar energy so the energy used to spin a turbine is stored as potential energy, to be released as kinetic energy when the snow later melts and flows through the turbine.

You didn't even ask a question..

We harness energy from gravity all the time. A significant portion of the world's energy comes from water turbines which are spun by water falling - because of gravity.

Wow! That is so great to learn that height reduces noise? Must be one of the reasons it is so appealing in a sensory way, had not realised this! Makes so much sense.

Usually you hear - repeatedly, domestically that height is very expensive due to material costs, where it seems everything is almost only just above door height in many developer builds.

All customs areas at smaller international airports lol.

In the airport where I work, the public areas are all tall ceilings 40 to 60 foot. I see lots of posts talking about baggage, etc. At my airport at least, that's all underground... As far down as the ceilings are high. We have several sublevels, including a dedicated level just for baggage handling, and another just for utilities, etc.

Ah thanks. Interesting. I’ve been on a wild medical journey the past five years. Have been to so many specialists and still have no answers. My blood work shows high levels of eosinophils and I am ANA positive. Have had worsening broken capillaries for about five years - started on face and now down to chest. Hives and severe itching started within last few months/weeks.

The exhibit A for this is the 60s Penn Station in Manhattan. They kept the basic functionality of the station but by putting it in a bunch of tunnels they turned it into a claustrophobic, unpleasant place.

This is interesting. Do similar mass of people go through other places and systems that are more enclosed in other areas of life, or does all architecture design for this in the same way? Thinking sports, trains and concerts.

Just go to O'hare if you want to try that.

Jousting required specialized equipment.

Primarily, heavier armor. A full suit of normal plate weighed about sixty pounds. Hefty, but that's similar to what a modern soldier carries into battle, and knights were surprisingly mobile. Jousting armor was much heavier and thicker, especially in the torso, by comparison.

Also, the lances were designed to limit penetration, either by blunting it or other methods to spread out the point of impact.

However, fact is that jousting was very dangerous and there were several fatalities over the centuries.

The key fact is that the arithmetic with those number systems implies that they have a special geometry to them (I'll try to say a little about what that means below). But this relationship to geometry constrains what dimensions these number systems can occur in. So 1, 2, 4, and 8 are the only ones where the number systems have the required special properties ("size" of numbers and inverse to multiplication are the crucial properties, but it gets more technical).

(Actually, 8 is a stretch; the octionions don't have associative multiplication, but they almost do. And there is a number system in dimension 16 that's even more of a stretch, but that's really it, for these types of number systems. The corresponding geometry is just too special to happen outside of these dimensions.)

This connection between arithmetic and geometry is really deep, and took mathematicians a loooonng time to figure out. It's not a coincidence that the only special dimensions are powers of two. If you are willing to have fewer special properties on your number system, so the corresponding geometry is less special, then you can have those number systems in other dimensions.

Here's an eli5 version of what I mean about the correspondence between number systems and geometry:

• Real numbers describe forward/backward motion (by addition) and scaling (by multiplication).

• Complex numbers describe rotation (by multiplication); their addition isn't significantly new.

• Quaternion multiplication (dimension 4) describes something more intricate having to do with twists that result from rotation (like when could cords become weirdly tisted).

• Octionions are even more tricky to describe; I don't think I can try here.

Source? Genuine question, not doubting you.

They actually had complex scoring systems where you got points for splintering your lance, or hitting certain body parts. obviously you got the most points for knocking your opponent off their horse. Each match usually consisted of four bouts, so even if you got un-horsed, you could potentially come back and win.

Ceramic is very hard. Not in the general, colloquial sense of hard, but in the Mohs Hardness Scale. That scale measures whether or not something can scratch something else. Diamond is the hardest on this scale - not because you can't break diamond. Diamonds are pretty brittle, you can easily crack or shatter them with a hammer. But you can't scratch them.

Tempered glass is made by putting the glass in tension. You cool the glass so that the outside shrinks, compressing the still-hot inside. When the inside then cools, the outside is frozen in place so the inside pulls tightly on it the inside contracts. The glass pulling on itself keeps the molecules from moving, and holds it all together strongly so it's very hard to break.

By scratching the surface, ceramic breaks the tension, releasing all of it throughout the glass.

but of course, most people arent spending more than a couple hours at most in the rain, and are hopefully drying off after, so it usually doesn't actually get you sick

This is why cold blooded creatures are superior life forms; We waste so much energy mindlessly, while a reptile has an excuse to sit back and back bask for hours on end

I think this just came out in the last couple of days, so don't feel like you're out of the loop or anything.

Adobe is becoming like the Amazon of design. They are acquiring everything, and unfortunately, we can't do our jobs with it. They acquired a major SaaS company, and now they're running wild with the subscription model.

Last week was the Adobe MAX conference, and they've now structured it so that all the good sessions are in person, and the virtual sessions I attended were absolute crap.

I've been an Adobe user since Illustrator88, but I feel like they've just jumped the shark at this point.

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You aren't. This is an "old wives' tale". Our immune systems are far more robust than this.

More energy spent on keeping your body warm = less energy going towards your immune system = more sick

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You're not, illnesses like colds etc are caused by viruses that you catch from other people. In winter time, viruses circulate more because people spend more time indoors because of the weather and it's easier to spread a virus indoors(lack of ventilation etc).