A handy explainer for the oft-cited (but rarely elucidated) factoid that every single person on Earth was once female — or, at a minimum, gender-neutral.
The spread of different languages in ancient times might seem like a difficult thing to track, but a big part of the story is actually hidden in our genes. Here's the twist: language change is a male-dominated phenomenon.
As far as male fertility is concerned, length really is important...except the length in question isn't the one you're thinking about. The crucial distance is actually the length between scrotum and anus. Yes, it's all about the taint.
If you're a vertebrate female, chances are that you're attracted to the color red, and that includes humans. It's one of the oddest facts in all biology - no matter what the species, women seem to love red.