A True Scale of Smell

25 February 2008
Presented by Diana O'Carroll.

This week, we find out if our noses tell us the truth.& Does a strong smell mean a lot of odour in the air, or can we be tricked by small smells?& In short, does our sense of smell have a sense of scale?& Also, we ask if more carbon dioxide in the air leads to bigger caves in the ground, and can you slow the growth of your hair by not having it cut?

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