DId you know your brain has an 'alerting system'? When it detects a change, it can trigger eye and head movements to gather more information.
Fear smells like sugar. At least that's the case for zebra fish.
Find out why melatonin is called "the hormone of darkness."
Starfish can regenerate their legs, worms can survive being cut into, but what creature can actually fix a broken heart? Find out on this Moment of Science.