What is a second?

What is a second? In this timely video Dallas takes rather longer to explain exactly what a second is.

24 March 2011

45 seconds

This clip is from

Bang Goes the Theory—Series 3, Episode 1

Gravity defying water?
Duration: 03:19
How do atomic clocks work?
Duration: 01:16
Oil spills explained
Duration: 03:39
The nature of time
Duration: 04:19

Without treatment a cholera patient could be dead in less than a day—Series 8, Disaster Relief
Duration: 01:40
The Standby Task Force—Series 8, Disaster Relief
Duration: 01:41
Have you got the cool head to work in the emergency response team?—Series 8, Trains
Duration: 02:34
Leaves on the track—Series 8, Trains
Duration: 02:13