There are a small number of biological rules that hold across every vertebrate: a spine, a heart, and haemoglobin to move oxygen around the body.
The last one has exactly…
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…
Try it. Run your fingers along your own ribs, or the sole of your own foot, using exactly the motion that would reduce you to helpless laughter if somebody else…
Most inherited traits are messy. Height involves hundreds of genetic contributions. Most physical characteristics are the product of many genes interacting with environment and chance, which is why family resemblance…