HumansHow fossil footprints are revealing the joy and fear of Stone Age life A new wave of archaeological investigations is reconstructing intimate details of our ancestors' lives from fossilised footprints. They give us glimpses of everything from parent-child relationships to the thrill of a giant sloth hunt Features
HealthLeaded petrol may have lowered the IQ of over half the US population Exposure to leaded petrol as a child has been linked to an average IQ drop of 2.6 points among US adults, increasing to 5.9 points among those born in the mid-to-late 1960s News