04:56 Physical Science How to squeeze electricity out of crystals Lesson duration 04:56 700,097 Views
05:31 Engineering Why don't perpetual motion machines ever work? Lesson duration 05:31 17,420,051 Views
04:08 Earth and Space Science How small are we in the scale of the universe? Lesson duration 04:08 1,150,213 Views
04:47 Physical Science Is there a limit to technological progress? Lesson duration 04:47 785,275 Views
04:45 Science & Technology Why doesn’t anything stick to Teflon? Lesson duration 04:45 3,120,732 Views