What does it mean for the speed of light to be constant?

Hi Everyone, Here's a short clip from a new informal video series I'm doing each week with Albert Einstein -- well, ok, his Facebook page. We'll cover a range of topics at a variety of levels....

==========

If you prefer to rent each film separately and not to join a subscription, Click Here..

What does it mean for the speed of light to be constant?

Embed the player