It was a woman. Who figured out we could drink other animal milks first, by watching a calf drink it. She probably needed it for a human baby. A lot of stuff that doesn’t make sense to men makes sense to women.

that seems plausible. I would imagine this happened on pretty early in human history, but it would have to be late enough that we had somewhat domesticated animals.

And it is a weird and boring question in the OP. He wants to rape a girl for money.

it's certainly weird, but so are a lot of questions, and it's boring, but then again, when are questions ever exciting lol.

As for philosophy, the single most intriguing question that has ever been asked is quite literally "what is the meaning of life"