Galilio, Da Vinci, Leeuwenhoek - Where do Babies come from?

The Great Battle between between spermists and ovists.

Yes, everyone suspected up to less than 150 years ago that having sex was involved in later having a child. BUT, dammit, just what was the in's and out's (Pun intended) of the whole thing.

The mystery and history of that old age question: Where do those babies come from?:



http://www.atlasobscura.com/articles/discovery-where-babies-come-from