How do pills know where pain is?

Why do ovaries run out of eggs? Why does diesel smell nice but burning engine oil is unpleasant? More of your science questions...
22 February 2013
Presented by Chris Smith, Redi Tlhabi

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Why do ovaries run out of eggs and what affects egg quality? Why does diesel smell nice but burning engine oil is unpleasant? Do genes from genetically modified organisms get into eggs and sperm? Does lead affect behaviour? What causes motion sickness? Join Dr Chris for another run of science questions from South Africa...

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