I’m too lazy to double check now, but afaik the problem with his voyage was the exact opposite. People knew that the earth was round and its approximate radius, so they knew that going all the way around the other side to India would be much too long of a voyage. What they didn’t know was that there was a whole other continent in the way.

I wrote my next essay in highlighter

When I went to school that would have been an automatic fail. We had clear rules about what we can and cannot write with (fountain pen was the standard, but some teachers were fine with ballpoint pens too).

It’s never difficult. Wikipedia cites sources. It’s very easy to check if any piece of information has citations and what those citations are.

That means that the gas above the boiling water is colder than the boiling water itself.

But if it’s colder then it’s not steam. It’s air mixed with water vapor. Steam is by definition hotter than boiling water.