Articles by

Sid Perkins

Radiometric dating puts pieces of the past in context. Here’s how

When a researcher picks up an object — whether it’s a scrap of leather from a dig...

Fossil tracks may reveal an ancient elephant nursery

Fossilized footprints found on a beach in southern Spain betray what may have been a nursery for...

Jupiter’s intense auroras superheat its upper atmosphere

Jupiter’s upper atmosphere is hundreds of degrees warmer than expected. After a decades-long search, scientists may have...

Marsquakes reveal the Red Planet boasts a liquid core half its diameter

Mars has had its first CT scan, thanks to analyses of seismic waves picked up by NASA’s...

Newly recognized tricks help elephants suck up huge amounts of water

Whether or not it’s possible to teach an old elephant new tricks, a 34-year-old pachyderm at Zoo...

T. rex’s incredible biting force came from its stiff lower jaw

The fearsome Tyrannosaurus rex could generate tremendous bone-crushing bite forces thanks to a stiff lower jaw. That...

Climate change may have changed the direction of the North Pole’s drift

A sudden zag in which way the North Pole was drifting in the 1990s probably stemmed in...

Earth sweeps up 5,200 tons of extraterrestrial dust each year

As our planet orbits the sun, it swoops through clouds of extraterrestrial dust — and several thousand...