One in five people in the UK suffer from hay fever every year - but even the worst affected could appreciate the beauty of pollen grains blown up by a million times. This gallery features false-colour scanning electron microscope pictures of the causes of hay fever. The number one culprit according to scientists is grass pollen - which close-up looks like a bundle of knobbly peas.
A false-colour scanning electron micrograph of grass pollen grains, a major cause of hay fever
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