Why does light bend under gravity?

01/24/11 • 4 min

Question of the Week, from the Naked Scientists

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. Like this podcast? Please help us by supporting the Naked Scientists

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How does the brain interpret Braille?

In this touchy-feely Question of the Week we find out which bits of the brain interpret text and Braille. Are they the same? Plus, we ask how it is that light bends under gravity, even though it's supposed to be massless! Like this podcast? Please help us by supporting the Naked Scientists

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What does it mean when soaps claim to kill 99.99% of germs?

Some hand washes claim to kill 99.99% of all germs. What do these advertising slogans really mean? Would two hand washes kill 100 per cent of all germs? Plus, we ask if sending an e-card is really more environmentally friendly than a paper one. Like this podcast? Please help us by supporting the Naked Scientists