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.

Between 1979 and 1999, the planet Neptune was farther from the Sun than Pluto. This won't happen again until 2227.

The world's termites outweigh the world's humans about 10 to 1.

AMAZING FACTS