There is nothing quite like the sensation of pepper spray in ones eyes and a few cracked ribs to bring this truth painfully home.

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Most models have small liquid-crystal display screens built in, so you can see your shots immediately and discard the ones in which Aunt Zoey has her eyes closed.

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Tests on monkeys, including ones in which the animals' eyes were held open to check that the beam does not blind, suggest it causes no permanent damage.

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Harvard neurobiology professor Margaret Livingstone found in her research on macaque monkeys that neurons in the brain respond to exaggerated features huge eyes or tiny noses more than to common ones.

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In Graham's eyes, the problem at the FDA is that the same scientists who approve drugs are the ones charged with deciding whether or not they are safe enough to remain on the market when problems crop up.

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