HealthBirds and breezes spread diseases Mathematical "power law" helps predict how fast diseases spread and suggests time is short for saving the planet's wheat 51¶¯Âþ
HealthAre we about to eliminate AIDS? Astonishingly, we could use existing drugs to wipe out HIV, just as we did smallpox. So what's holding us back? 51¶¯Âþ investigates Features