Feel your pulse by placing two fingers at pulse ... are so small that it takes ten of them to equal the thickness of a human hair. Your body has about 5.6 liters (6 quarts) of blood.

Bristol boffins want to understand the effect live music has on the human body: earlier today they were counting the heart ...

Although these Homo sapiens populations got an evolutionary advantage from the new Neanderthal genes, not everyone who mingled with Neanderthals made it, and some modern human lineages went extinct.