Ask The Naked Scientists

Ask the Naked Scientists SA episode

Fri, 30th Sep 2011

Can frozen onions make you cry?

One whole and one cut onion (showing onion rings). (c) Donovan Govan

Why do onions make you cry and will a frozen onion have the same tear-jerking effect? What medicinal qualities does aloe vera possess? Is ice-crunching harmful? What's the best way to prop up metabolism as we age? What can I do about stress incontinence? Plus, news of what Tweets posted online can tell us about the population's collective mood, and a new way to tell who needs extra investigations after a heart attack...

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