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Doctor Who: Is time travel possible?

Doctor Who: Is time travel possible? Copyrighted image Credit: © Mreco99 | Dreamstime.com
Introductory Level Duration 5 mins Updated 12 Nov 2013
Is time travel possible in real life? The simple answer is: Yes!

Light: Wave-particle duality

Light: Wave-particle duality Creative commons image Credit: By Douglas Hofstadter [CC-BY-SA-3.0], via Wikimedia Commons
Introductory Level Duration 10 mins Updated 11 Sep 2013
One of the most confusing concepts in physics, wave-particle duality is unlike anything we see in the ordinary world.