Derrick Pitts, chief astronomer and planetarium director at the Franklin Institute Science Museum, joins “CBS This Morning: Saturday” to discuss the Caldera Volcano, a supervolcano, that sits ... more 
Derrick Pitts, chief astronomer and planetarium director at the Franklin Institute Science Museum, joins “CBS This Morning: Saturday” to discuss the Caldera Volcano, a supervolcano, that sits underneath Yellowstone National Park. less 
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Sat, Dec 28, 2013 3:40 PM EST