LifeOldest human genome reveals roots of first Americans A 24,000-year-old boy from Siberia is helping redraw the Native American family tree – and its roots spread further than we thought ¿ìè¶ÌÊÓÆµ
LifeRun yourself smarter: How exercise boosts your brain Working up a sweat is the best way to fertilise your neurons and add fizz to your brain chemistry. Athleticism might even explain the human brain's evolution Features