Renowned paleontologist Jack Horner has spent his career trying to reconstruct a dinosaur. He's found fossils with extraordinarily well-preserved blood vessels and soft tissues, but never intact DNA. So, in a new approach, he's taking living descendants of the dinosaur (chickens) and genetically engineering them to reactivate ancestral traits — including teeth, tails, and even hands — to make a "Chickenosaurus".

The Great Morning Planet Show of May 2011 is underway. Wake up before sunrise any day this month to see a shape-shifting alignment of heavenly lights.

At TED2010, Bill Gates unveils his vision for the world's energy future, describing the need for "miracles" to avoid planetary catastrophe and explaining why he's backing a dramatically different type of nuclear reactor. The necessary goal? Zero carbon emissions globally by 2050.

James Williams uncovers five spooky scientific mysteries you may never have heard of.

Will the real ET be little green men or little green bacteria? SETI Institute Senior Astronomer Seth Shostak theorizes what our first alien encounter might be like.

Genese - This is the best medical animation video

See images of the largest asteroid ever seen up close by humans. The European Space Agency's Rosetta spacecraft took the first close-up images Saturday of asteroid 21 Lutetia, located between Mars and Jupiter. Video Courtesy ESA

Planetary scientist Carolyn Porco shows images from the Cassini voyage to Saturn, focusing on its largest moon, Titan, and on frozen Enceladus, which seems to shoot jets of ice.

AA-12 Shotgun On Future Weapons

Dry Ice and Soap. See what happens when you mix them both