Like a cocktail partygoer able to focus on one discussion in a noisy room, brains are able to make reliable connections against a busy neural background. Here are two phenomena that help it happen.
Even fridge magnets have magnetic fields approximately 200 times stronger than Earth's.
Many living vertebrates have the ability to detect electric fields, especially in other animals when hunting. But what can the fossil record tell us about the origins of this sensory system?