The intuitive picture is that an infection generates heat, the way a fire in a room raises the room's temperature. It does not work like that. The heat is produced…
Source: Wikipedia
The list of five senses is about two and a half thousand years old and it was never complete. The one left out is the one you are using…
A traffic light looks like the simplest control system in existence: three lamps, one at a time, in a fixed order. Almost everything about it is a compromise between constraints…
Source: Wikipedia
Most insects live fast. A mayfly is famous for having a day. Periodical cicadas run the opposite strategy to an extreme that has no real parallel: nearly two decades…
A Turtle’s Shell Is Its Own Ribcage and Spine Fused Into a Box, Which Is Why It Cannot Ever Leave It
Almost every popular depiction of a turtle gets this wrong in the same way, treating the shell as a portable house. The reality is stranger, because building a box out…
One foot, one shell it cannot leave, and thousands of teeth. Here are fifteen.
1. It Moves by Sending a Wave Along One Foot
Bands of muscle contract in sequence…