Archaea are organisms consisting of a single cell without a nucleus and with distinct structural, physiological and evolutionary characteristics. They inhabit a wide range of habitats, including ...

Play a new set of challenges as you train through the dojo. Gain achievements and earn new karate belts. Struggling with grammar, punctuation or spelling? The Karate Cats are here to help!

AI & Humanoids Artificial Intelligence may prove to be a more significant milestone than the harnessing of fire, or the invention of the wheel. It's the fastest-evolving technology the world has ...