The medieval period was called the dark ages largely because of our ignorance of it. The Medieval spans about 1,000 years. There were plagues which made labor immensely more valuable, & wars that lasted generations. Any blanket statement about it is bound to be somewhere between false and meaningless. Including this one.

Day Traders only exist because of this. Bull markets allow them to exist.

When you twiddle your thumbs, your thumbnails always point the same direction relative to each other. So the bolts relative rotation will maintain that. Imagine a stripe on the face towards us of the bolts, and twiddling action will not rotate the stripe in an absolute or relative sense.

For the two bolts, this is equivalent to rotating both bolts so the stripe stays in the same relative position, as if one were rotated around the other or they were twisted in the same absolute direction. If you are concerned about symmetry violation because of the direction of the threads, you can reverse the threads on both bolts, with the same result. You can try this with a couple of bolts and a couple of rubber bands to keep them in the same relative position. The illustration is a hint that the motion is equivalent to rotating both in the same absolute direction (near side moving up.) Then view that system from the head and note the direction each would be moving, away or towards you.

If you have to undo a bolt or nut from behind, the bolt head moves in a reverse direction from your viewpoint, just as if you were to view a glass clock from behind.

I'm concerned about the same mechanism that causes permanent loss of taste with zinc lozenges, and if it applies here. I don't want to poison the nerves in my genitals. It isn't a common or widespread effect, but it is severe.

The button has no downside, with a possible benefit, so always push it. Also refers to discredited Bystander effect nonsense regarding Kitty Genocese murder: "there is no evidence for the presence of 38 witnesses, or that witnesses observed the murder, or that witnesses remained inactive." https://psycnet.apa.org/doiLanding?doi=10.1037%2F0003-066X.6...

Only affects Apple silicon chips (intel unaffected) with ProMotion display. Just a quick Exit clause for people with older machines.