About 280 million years ago a "supervolcano" eruption rocked Italy and may have triggered prolonged global cooling, say scientists who found the volcano and its unusual insides.

Dubai glitters in a space station view, a hundred-ton antenna catches a lift, an Indian probe spots traces of water on the moon, and more in the best new space pictures of the week.

Don't look for seeing-eye cheetahs anytime soon, but the big cats may help disabled people in another way—by inspiring better artificial legs. Video.

New species discovered along Asia's Mekong River in 2008—including a leopard gecko and a fanged frog that eats birds—are already under serious threat because of climate change, WWF says. Video.

The battery-powered "personal mobility device," designed by Japan's Honda Motor Company, is steered as a rider shifts his or her weight in the desired direction. Video.

It turns out you can build Rome in a day, according to researchers using a new computer program that analyzes pictures posted online to rapidly reconstruct cities in 3-D.

A sharp-eyed spacecraft has uncovered pure water ice—and perhaps liquid water—much closer to the planet's equator than thought, new images show.

To help save South Australia's rare black-footed wallaby, researchers are taking joeys from the wild and placing them in surrogate pouches, encouraging wild moms to trigger "backup" pregnancies. Video.

It's only in trace amounts bound to other molecules, but water does in fact exist on the moon, according to an international trio of mapping satellites.

Quelling theories of a mysterious supervoid or even an "imprint" of a parallel universe, a new study says the cold region is a completely unspecial fluke of statistics.

Will day and night really be equally long on September 22, 2009, the autumnal equinox (or fall equinox)? Get the answer—and other first-day-of-fall facts.

Using astronomy and archaeology, it's possible to calculate the exact day the ancient Egyptians started building the Great Pyramid of Giza, according to controversial new research.

On the 143rd anniversary of H.G. Wells's birth, several of the writer's inventions—such as moving walkways and sliding doors—have become reality while others, like the time machine, remain science fiction.

UPDATE: A gelatinous fish found off Brazil's Bahia coast has been touted as a previously unknown species. But the six-foot-long, toothed oddity may be a known member of a group of mysterious bottom-dwellers known as jellynose fish, another expert says. Video.

How well do you know H.G. Wells? Test your knowledge of the life and works of one of the fathers of science fiction today, his 143rd birthday.