What is the one thing you need to know to understand the big bang, relativity, global warming...?

Award-winning broadcaster and author Marcus Chown gives the lowdown on why Einstein’s special theory of relativity follows from the fact that nothing can catch up a beam of light; how global warming follows from the fact that small molecules are effectively connected by springs; and how the hotness of the Sun follows from the fact it is terribly, terribly massive.

Join Chown for a breakdown of the big physics questions that explain our universe.

Presented by Marcus Chown