I bet you didn't know that this thread would have a part 2

To put that into perspective; the fastest speed humans have travelled in a vehicle was 25,000 MPH in Apollo 10 when it was returning from orbiting the moon. Though all the Apollo missions were within one percent of that speed. By comparison the Space Shuttle topped out at 17,500 MPH. Even if you filled its cargo bay with fuel tanks it wouldn't have enough to reach the moon. Well I suppose it would eventually. But then it would have to come back and if it came back at 25,000 MPH it would burn up like a match.

For Apollo to get to the moon from Earth orbit it needed this third stage of the Saturn V rocket assembly.

Basically a tube of fuel containing quarter of a million litres of liquid hydrogen firing through a nozzle for a couple of minutes to get them up to 25,000 MPH. At launch the Saturn V's engines guzzled 20 tonnes of fuel per second.

Not a great time to be alive. 40 people died of teeth.

That was a real issue. Before antibiotics and dentistry that didn'y involve tying a bit of string to a rotten tooth and the tying the other end to a nasty donkey a rotten tooth could quite easily kill people, certainly a mouthful of them could. Especially to urban living people who were exposed on an annual basis to a set of rolling "plagues" of every stripe weakening them. Interestingly in the earlier records of towns and villages, teeth are almost never mentioned. Throughout history people had generally much better teeth than in more recent times*. Crowding in the jaw was also very rare and wisdom teeth erupted without issue. The further back you go, the fewer the teeth problems. Stone Age man would leave a modern dentist looking for another career. Bugger all sugar and tougher food requiring more chewing saw to that. It was when cheap sugar from the colonies started to flood into Europe that "teeth" start to appear as a cause of death and with some regularity. People jumped on this new trend with vigour. Recipes of the time instruct on how to make facsimiles of common foods in moulded sugar with food colouring to complete the effect. On going for dinner in a middle class house you might be treated to a plate of bacon and eggs, only entirely made from sugar.

*Though there were exceptions of course. Ancient Egyptians could suffer from bad teeth because of their diet. A diet that included a lot of flour, but flour ground in grindstones that sloughed off tiny grains of grit into the flour. It wore their teeth down basically, exposing the pulp and leading to pain and tooth loss. In other times it was the rich who suffered because they could afford sweeter foods and more starches. The poor had generally better gnashers. We can even see this going waaaay back. For example there was a study into the teeth of two Neandertal groups living in different environments 90 odd 1000 years ago. One ate far more grains and root veggies(full of starch), the others ate an almost exclusively meat based diet. The former grain eaters while having OK teeth, showed much more evidence of cavities, even abcesses than the latter meat eaters who hadn't a dental issue among their number.