The human body is full of mysteries. One of these is the sensitivity of our teeth. Ever wondered why a cold treat or a dentist's drill can make your teeth zing? The answer lies in the distant past, with ancient armored fish. These fish, living around 500 million years ago, had exoskeletons that were surprisingly complex. Scientists initially thought these scales bel...

A man named Tim Friede has a unique claim to fame. He has injected himself with snake venom 856 times over 18 years. This might sound crazy, but it has led to a big breakthrough in medicine. Friede's blood could hold the key to a universal antivenom. Friede's journey started when he was young, collecting pet snakes. He began injecting himself with diluted snake veno...