Ask a paleontologist about the mystery behind this whale graveyard!

Over 5 million years ago, a mass stranding of whales created what is now a whale graveyard in modern day Chile. Just why those whales died was a mystery — until now. Nick Pyenson, the paleontologist who led the team that cracked the case, is here to answer your questions! » 2/27/14 10:30am 2/27/14 10:30am

Ask a volcanologist anything you want to know about volcanoes!

Volcanoes! Whether we're talking about Pompeii, why some volcanoes in Indonesia are erupting with blue lava, or the mechanics of supervolcanoes, they're totally fascinating. Today, we have a volcanologist in to answer your questions about volcanoes, eruptions, and their aftereffects. » 2/24/14 9:10am 2/24/14 9:10am

Ask an expert about robots, space, and space robots right now!

By now, you've probably seen RoboSimian — the four-limbed, ape-inspired robot built by the Jet Propulsion Lab — in action at least once (and if you haven't, seriously, check it out now). Today, we've got Brett Kennedy, who leads the RoboSimian team at JPL, here to answer all our questions about robots, space, and… » 1/15/14 10:41am 1/15/14 10:41am

Ask an astrophysicist anything you want about nearby asteroids!

Amy Mainzer is an astrophysicist at the Jet Propulsion Lab who builds instruments for space telescopes that allow us to study Earth's nearest neighbors, including asteroids, comets, and stars. She's here today to answer your questions about all the objects whizzing past Earth — and which ones we should be keeping our… » 11/21/13 9:30am 11/21/13 9:30am