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.

Each day 400 gallons of recycled blood are pumped through the kidneys.

The shape of plant collenchyma's cells and the shape of the bubbles in beer foam are the same - they are orthotetrachidecahedrons.

AMAZING FACTS