How far is a second?
Why do we measure distances using time? Remix your sense of measurement with a short sweet video from MinutePhysics and join the next Science on Google+ #Newtonmas hangout with MinutePhysics and Carin Bondar in just two days. RSVP: http://goo.gl/0PYzUB
http://www.youtube.com/watch?v=Wp20Sc8qPeo//cdn.embedly.com/widgets/platform.js
Science on Google+ 
Google Science Fair should join in on the physics fun! Leave questions for Henry Reich on the event mage.
LikeLike
this is also explained in a brief history of time
LikeLike