There is a category of biological feature that only makes sense as a leftover, and the third molars are the most familiar example.
They appear late, typically in the late…
Blood Types Were Discovered Over a Century Ago and Nobody Has Established What They Are Actually For
Most people know their blood type, treat it as a fixed personal fact like eye colour, and have never wondered what it is.
It is a molecule. Specifically, blood type…
Goosebumps are among the strangest things the human body does routinely. A sensation arrives — cold air, a piece of music, someone's fingertips on the back of your neck —…
Hiccups are so ordinary that almost nobody asks what they are for. Everyone gets them, they arrive unbidden, they are mildly annoying, and they go away.
But consider what is…