Spiked and studded dog-collars derive from the days of the Ancient Greeks, who would give their sheep-dogs sharply spiked collars to protect their necks from wolves whilst they watched over a Sheppard's flock at night.

A snail can slide over a razor blade without being hurt by producing slime that helps it slide harmlessly.

John Lennons first girlfriend was named Thelma Pickles.

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