I want to ask about Fourier's life. While traveling with Napoleon, he founded an institute in Cairo called the Cairo Institute. Because I have lived in Cairo, I am just curious where that institute was. But I find scant info online, and nothing on Wikipedia, possibly because there are dozens of places that carry the name 'Cairo Institute.' Please advise if this is on-topic enough.
History of mathematics should be on topic for this site. If people want to know about whether János Bolyai really killed thirteen opponents in duels, this should be a good home for such questions.
History of mathematics is less troublesome than philosophy of mathematics, because it is less argumentative, but there seems to be general agreement that philosophy of mathematics is on topic.