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.

Sometimes whales make navigation mistakes during migrations. Although they may have made the mistake days before, they don't realize it until they becoming stranded.

The citric acid found in lemon juice is said to be able to dissolve a pearl.

AMAZING FACTS