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When a Roman Emperor died and they had to "print" new faces on coins, did the old coins become pointless or did people get to exchange them for new ones?

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So I was reading about the U-2 incident again today, having studied it briefly in school. One thing which I never got a satisfactory answer to was what exactly the US expected to happen when they were flying the plane over Soviet airspace. Was it that they thought the Soviets couldn't see the plane with their radar? Or were the SAM's the Soviets used an unknown technology to the Americans? Either way, it seems like the incident was quite a big blunder by the CIA at the time.

Curious what that guy might have been carpentering. Was it chairs? Did people have cabinets back then? One of you surely know...

I know that Garibaldi likely wasn't actually offered anything, but even the idea of it seems so far out of left field. Did anyone believe this? Was there any sort of precedent for the idea?

I mean fifty years ago, segregation was the norm, lynchings still happened, and interracial relationships were illegal but today, everything has changed. It just all seems very sudden. Today just seems like a whole different world compared to back then. What changed?

This could apply to a range of groups from the Cumans to the Persians to the Mongols to the Magyars, etc. I get the general idea, that once you own territory you need to garrison it and live there instead of in gers and yurts; and that generally as you aquire more territory you raise larger armies which need baggage trains and your force can't be a "horde" anymore. Is there anything I'm missing here with the transition from a horde power to a settled power?

Governors could not wage their own wars, levy their own taxes, or impose their own laws without the Head of State's approval.

Gyms are common in America, as other athletic activities like running. When did this become a thing for the average citizen?

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I often see the claim stated as fact but rarely with primary or secondary source material to back it up; I would like to know how accurate this is if anyone with knowledge would like to set me straight.

I know the nature of colonial chattel slavery was different from the slavery practiced in the Roman Empire, but I find it hard to believe that people just flat out stopped owning other people for 1000 years, yet I never see it discussed in reference to that time period.

In the modern age, we have medicines, quarantine, and sanitation, so housing many sick people in one building without everyone catching what everyone else has is feasible. How did they get around this centuries ago? If they didn't, then why did they construct hospitals if they were so innefective?

If I were to cosplay as a Viking and be as historically accurate as I could, what would I wear? What would I carry? Eat? Speak?

In The Pursuit of Power, Richard Evans states that Garibaldi became a fashion icon. What style did he bring about? What were his contributions?

We've all seen movies where they do coordinated line dances perfectly in sync at Victorian balls. They're in practically every period piece about the era. Was that a real thing?

(PS I feel that this is a very stupid and embarrassing question but googling did me no good)

The Battle of the Coral Sea in May, 1942, was the first time that a major fleet action was fought entirely out of visual range of surface ships; instead, it was almost entirely fought by carrier-based aircraft as the primary offensive weapons. And, while both sides managed to inflict serious wounds upon one another, each also sustained heavy losses; neither side's naval command could have looked at the outcome of the battle and been entirely satisfied.

So, what lessons did the two navies, the IJN an the USN, take away from this engagement? How did it fit their expectations of what carrier-v.-carrier combat would look like? Did later carrier-v.-carrier battles look essentially the same as Coral Sea, or was this first engagement a sloppy affair bearing little resemblance to the battles that followed?