Can frozen onions make you cry?

30 September 2011
Presented by Chris Smith, Redi Tlhabi


One whole and one cut onion (showing onion rings).


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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