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. | Wolves have two layers of fur, an undercoat and a top coat, which allow them to survive in temperatures as low at minus 40 degrees Celsius! In warmer weather they flatten their fur to keep cool. | Lions cannot roar until they reach the age of two. | Human birth control pills work on gorillas. | Two out of five people end up marrying their first love.

A year from now you will wish you had started today.