Allorecognition is a key component to medical procedures like organ transplants, so these weird sea creatures, who might be big Spice Girls fans, could hold the key to advances in immune system ...

An extinct ribbonlike sea creature about the size of a human thumb was one of the earliest animals to evolve a precursor of a backbone. Scientists recently identified the animal’s nerve cord by ...

A picture of the arachnid, later identified as a "pachylus crassus." A man in Chile came across the grotesque creature as he was about to take a shower. A picture of the arachnid, later identified ...

The animal measured roughly 1.6 inches (4 centimeters ... “Pikaia’s suddenly become a lot less weird,” he said. Reevaluating which way was up for Pikaia originated years ago with a coauthor ...