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King William III of The Netherlands (1817–1890) married Princes Emma of Waldeck and Pyrmont when he was 61, she was 41 years his junior at the time. On top of that, Emma’s stepmother, Louise of Schleswig-Holstein-Sonderburg-Glücksburg was only eight months older than she was, making William effectively 41 years older than his mother-in-law.

English: King William III and Queen Emma of th...

King William III and Queen Emma of the Netherlands

Fingernails grow four times faster than toenails.

The combined growth of all the hairs on the average human head is about 30m (100ft) in a day, or 11km (7 miles) in a year.

The human body grows a new stomach lining every five days. The average lifespan of a human taste bud is ten days. The body grows a completely new skin every four weeks. The liver is replaced every six weeks. The human skeleton is replaced every three months.

Gregor Mendel (1822-84), the monk who founded the science of genetics, failed his teacher training course at the age of 28, getting his lowest marks in the biology paper. He taught all his life but never managed to pass the exam.

See other: Quite Interesting Facts

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No birds have teeth, but baby birds have an ‘egg-tooth’ – a small hard growth which they use to break out of their shells and which falls off soon after hatching.

Phoenix dactylifera

Phoenix Dactylifera

The smallest trees in the world are the dwarf willows that grow on the tundra of Greenland. They are only two inches tall.

Most of the dozen or so species of date palms in the genus Phoenix (family Palmae) are grown as ornamental plants. Only the common date palm, Phoenix dactylifera is grown for its fruit.

Johann Gregor Mendel (1822-84) is known as the ‘Father of Genetics’. For eight years (1856-63) he studied peas, growing over 10,000 pea plants and carefully noting the results.

Red kangaroos give birth to only one baby at a time, but have a spare fertilised egg in their bodies. If the first baby dies, the second egg develops into a fully- grown kangaroo.

See other: Quite Interesting Facts