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02:39 The Arts Why babies in medieval paintings look like ugly old men Lesson duration 02:39 7,699,465 Views
05:31 Engineering Why don't perpetual motion machines ever work? Lesson duration 05:31 16,788,095 Views
01:40 History How the bendy straw was invented | Moments of Vision 12 Lesson duration 01:40 424,449 Views
04:33 History Who were the Vestal Virgins, and what was their job? Lesson duration 04:33 9,927,997 Views
13:57 Health What you can do to prevent Alzheimer's | Lisa Genova Lesson duration 13:57 3,280,801 Views
05:30 Environmental Science Meet The Frog That Barfs Up Its Babies Lesson duration 05:30 2,078,853 Views
05:07 Data Analysis & Probability Check your intuition: The birthday problem Lesson duration 05:07 2,824,384 Views
01:51 Social Studies How the popsicle was invented | Moments of Vision 11 Lesson duration 01:51 460,577 Views
