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Dinos!

1. Jack Horner: Building a dinosaur from a chicken

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".

2. Paul Sereno: Digging up dinosaurs

Strange landscapes, scorching heat and (sometimes) mad crocodiles await scientists seeking clues to evolution's genius. Paleontologist Paul Sereno talks about his surprising encounters with prehistory — and a new way to help students join the adventure.

3. Peter Ward: A theory of Earth's mass extinctions

Asteroid strikes get all the coverage, but "Medea Hypothesis" author Peter Ward argues that most of Earth's mass extinctions were caused by lowly bacteria. The culprit, a poison called hydrogen sulfide, may have an interesting application in medicine.

4. Jack Horner: Where are the baby dinosaurs?

In a spellbinding talk, paleontologist Jack Horner tells the story of how iconoclastic thinking revealed a shocking secret about some of our most beloved dinosaurs.

5. David Christian: The history of our world in 18 minutes

Backed by stunning illustrations, David Christian narrates a complete history of the universe, from the Big Bang to the Internet, in a riveting 18 minutes. This is "Big History": an enlightening, wide-angle look at complexity, life and humanity, set against our slim share of the cosmic timeline.

6. Phil Plait: How to defend Earth from asteroids

What's six miles wide and can end civilization in an instant? An asteroid — and there are lots of them out there. With humor and great visuals, Phil Plait enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them.

7. Caleb Chung: Playtime with Pleo, your robotic dinosaur friend

Pleo the robot dinosaur acts like a living pet — exploring, cuddling, playing, reacting and learning. Inventor Caleb Chung talks about Pleo and his wild toy career at EG07, on the week that Pleo shipped to stores for the first time.