Painfully pongy

STRONG smells aren’t just revolting, they can also give you a headache, and biologists in North Carolina think they know why. One of the causes of headaches is thought to be an increase in blood flow to the cortex. Suspecting that this might be the link between smell and headaches, Wayne Silver of Wake Forest University in Winston-Salem and his colleagues tested four strong-smelling chemicals on rats. Three of them increased blood flow to the rats’ cortex by up to 20 per cent (Chemical Senses, vol 24,
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