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Science editor Alan Boyle's Weblog: A comparison of pterosaur fossils and bird bones indicates that the flying reptiles had to walk around and launch into the air on four legs. »» Wed, 7 Jan 2009 00:18:29 GMT

Gladiators are to return to Rome's most famous fight arena almost 2,000 years after their bloody sport last entertained Roman crowds, local authorities announced. »» Tue, 6 Jan 2009 18:04:35 GMT

It's a classic image from every youngster's science textbook: a cutaway image of Earth's interior. The brown crust is paper-thin; the warm mantle orange, the seething liquid of the outer core yellow, and at the center the core, a ball of solid, red-hot iron. Now a new theory aims to rewrite it all by proposing the seemingly impossible: Earth has not one but two inner cores. »» Tue, 6 Jan 2009 19:56:34 GMT

When English naturalist Charles Darwin explored the Galapagos Islands in the early 1800s, he, and countless scientists since, overlooked a hefty pink iguana. »» Tue, 6 Jan 2009 00:31:27 GMT

Seventeen previously unknown species of reptiles and amphibians have been found in the threatened rainforests of eastern Tanzania, Italian and Tanzanian scientists reported on Monday. »» Mon, 5 Jan 2009 16:33:45 GMT

AP - Wildlife experts are trying to figure out why sick, disoriented and bruised California brown pelicans are being found in record numbers along more than 1,000 miles of coastline. »» Wed, 07 Jan 2009 09:35:22 GMT

AP - The Grand Canyon, Mount Everest and Loch Ness will vie with more than 200 other spectacular places in the next phase of the global competition for the New 7 Wonders of Nature, organizers said Wednesday. »» Wed, 07 Jan 2009 12:11:08 GMT

AP - In the largest marine conservation effort in history, President George W. Bush on Tuesday designated what he called three beautiful and biologically diverse areas of the Pacific Ocean as national marine monuments. »» Tue, 06 Jan 2009 19:59:07 GMT

AP - Take that, Andromeda! For decades, astronomers thought when it came to the major galaxies in Earth's cosmic neighborhood, our Milky Way was a weak sister to the larger Andromeda. Not anymore. »» Tue, 06 Jan 2009 05:01:14 GMT

LiveScience.com - It seems likely that a mysterious set of UFO lights that appeared over Phoenix, Arizona last year made an unexpected reappearance over New Jersey on Monday night. »» Wed, 07 Jan 2009 04:58:14 GMT

The planet Jupiter must have gained mass fast during its infancy, according to astronomers. »» Tue, 06 Jan 2009 17:31:52 GMT

The US is to establish the largest area of protected sea in the world, banning fishing and mining, around its Pacific islands. »» Tue, 06 Jan 2009 03:10:33 GMT

The Milky Way has 50% more mass and is travelling 120,000km per hour faster than once thought, a study shows. »» Tue, 06 Jan 2009 13:51:16 GMT

Scientists from the UK Ministry of Defence (MoD) have devised ultra-hard vehicle armour to protect military personnel. »» Mon, 05 Jan 2009 18:08:57 GMT

Pterosaurs have long suffered an identity crisis. Pop culture heedlessly -- and wrongly -- lumps these extinct flying lizards in with dinosaurs. Even paleontologists assumed that because the creatures flew, they were birdlike in many ways, such as using only two legs to take flight.