04:56 Physical Science How to squeeze electricity out of crystals Lesson duration 04:56 708,044 Views
05:31 Engineering Why don't perpetual motion machines ever work? Lesson duration 05:31 17,539,333 Views
04:08 Earth and Space Science How small are we in the scale of the universe? Lesson duration 04:08 1,162,417 Views
04:47 Physical Science Is there a limit to technological progress? Lesson duration 04:47 790,792 Views
04:45 Science & Technology Why doesn’t anything stick to Teflon? Lesson duration 04:45 3,125,667 Views
