Albert Einstein, 1921

Why No One Believed Einstein

Einstein's theory of relativity presented a direct challenge to the notion of ether.
Airships and Flying Machines

The Natural Resources You Didn’t Know You Needed

Fossil fuels might get all the attention, but a recent discovery in Tanzania is a reminder of the other, less-heralded natural resources that we use.
Enceladus

The Mysterious Ocean of Enceladus

Saturn’s moon Enceladus has a secret. For some years, scientists have been convinced that there is a liquid ...
synthetic stingray

The Next Frontier in Synthetic Biology

Researchers have built something pretty weird­—an artificial stingray. Ethicists and legal experts are still debating the rise of synthetic biology.
Fireflies

The Nuptial Gifts of the Firefly

Fireflies, lightning bugs, glowworms: the evocative insects of summer reveal some surprising new insights into biology.
Hevelius map

Where Did the Moon Come From?

Despite years of study, it is only since the 1980s that a theory of the moon's origin has coalesced.
Buzz Aldrin with equipment on the moon

What the Space Race Left Behind

How should the artifacts of the space race be preserved?
Roller coaster in Atlantic City

What Makes Your Roller Coaster Go? Physics!

The physics behind the fun: roller coasters provide so many examples of basic principles that they are a staple of physics lessons. 

Where in the Solar System is Vulcan?

A hypothetical Planet Vulcan was the best explanation for strange astrological phenomena—until Einstein, that is. 

Neanderthals Were Smarter Than You Think

Neanderthals, suggest recent studies, had complex societies and even some culture.