Question of the Week Podcast

Question of the Week episode

Mon, 24th Jan 2011

Why does light bend under gravity?

Making photons identical. A multi-photon down-conversion source in Bristol. (c) Photograph by Jonathan Matthews

Light is supposed to be massless so how is it that gravity makes a beam bend? Plus, we ask what the hand wash adverts mean when they claim to "kill 99.9% of known germs."

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