NewScientist The Last Word - Tag 'bad' details

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Sour Cream How can you tell when sour cream has gone bad? (I saw this question on 'things that make you go hmmm..' on Brainiac: science abuse)
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Can smelly things be good things? Evolution has provided us with the ability to avoid bad-smelling or bad-tasting things, because generally they are not good for us, being waste products or rotted material. Is there any substance that we may find repellent by taste or smell but which is actually good for us?
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