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00:04:05
On the cliffs above San Francisco's Ocean Beach perches a landmark observatory—a giant camera obscura. Step inside with Robert Tacchetto and see how this centuries-old technology creates enchanting images of the outside world.

00:19:33
What makes one individual "fitter" than another? Staff scientist Karen Kalumuck introduces natural selection, then four teams of "predators" compete with each other for prey.Who will thrive and who will face extinction?

1:26:20
Professor Anders Barany, Deputy Director of the Nobel Museum and former secretary of the physics commitee that awards the Nobel Prize, speaks about what makes the Nobel Prize one of the world's most prestigious honors. He gives an insider's tour of Alfred Nobel's will and how laureates are chosen and celebrated.

0:47:31
We explore behind the scenes in the "tank room" of the Darwin Centre, where thousands of biological specimens up to 300 years old are kept.

0:41:59
Bat curator Richard Harbord and photographer Frank Greenaway explore questions about our furry flying friends in Belize. We also talk with bat experts in London and at the Exploratorium.