04:05 Design, Engineering & Technology How to spot a counterfeit bill Lesson duration 04:05 1,036,686 Views
04:53 Design, Engineering & Technology What's the difference between accuracy and precision? Lesson duration 04:53 5,963,988 Views
04:57 Design, Engineering & Technology Camera or eye: Which sees better? Lesson duration 04:57 1,656,073 Views
04:03 Science & Technology The effects of underwater pressure on the body Lesson duration 04:03 665,464 Views
04:51 Philosophy & Religion What did democracy really mean in Athens? Lesson duration 04:51 1,487,078 Views
