Ancient Martian lava flows, space shuttle Endeavour, the Pinwheel Galaxy, and millions of stars shine in this week's best space images.

Increasing number of Americans are heading overseas for expensive, unregulated stem cell treatments. U.S. doctors today issued new warnings against such procedures, but for the desperate, hope is worth the money.

As tiger numbers dwindle, poachers are turning to leopards to satisfy China's demand for big cats, whose parts are used as decoration and in traditional medicine.

Half to three quarters of major emperor and Adelie penguin populations may lose their sea ice habitat due to climate change, according to a recent report.

Using virtual reality goggles, a kitchen knife, and mannequins, scientists can now reportedly make subjects "feel" another "body" being cut, among other sensations.

Knee-deep gondoliers breakfasted at café tables, rubber-booted locals waded through a pastry shop—despite a five-foot flood Monday, pockets of Venice showed surprising normalcy.

Despite months of warfare and no protection for 15 months, a mountain gorilla family in Congo has been found with five newborns on a volcanic mountainside.

Skywatchers across the world witnessed a rare celestial trifecta Monday night as Venus and Jupiter joined a thin crescent moon to form a giant grin.

The race is officially on for the team who can find the best way to harness the oceans' power as a serious energy alternative to fossil fuels.

The race is officially on for the team who can find the best way to harness the oceans' power as a serious energy alternative to fossil fuels.

Prehistoric turtle fossils discovered in China without fully formed shells may be the missing link that shows how the modern-day reptiles got their distinctive hard backs, experts say.