06:10 Philosophy Are you a body with a mind or a mind with a body? lesson duration 06:10 2,970,924 views
05:41 Education Policy Should we get rid of standardized testing? lesson duration 05:41 1,052,198 views
05:17 Geometry How many ways are there to prove the Pythagorean theorem? lesson duration 05:17 2,958,395 views
04:28 Environmental Science Will the ocean ever run out of fish? lesson duration 04:28 1,195,373 views
04:20 Life Sciences The ferocious predatory dinosaurs of Cretaceous Sahara lesson duration 04:20 1,867,198 views
05:31 Engineering Why don't perpetual motion machines ever work? lesson duration 05:31 15,132,758 views
