For an observer standing on the ground with h = 1.70 metres (5 ft 7 in) (average eye-level height), the horizon is at a distance of 4.7 kilometres (2.9 mi). For an observer standing on the ground with h = 2 metres (6 ft 7 in), the horizon is at a distance of 5 kilometres (3.1 mi).
What did the winners receive in the ancient Olympic games?
The olive wreath also known as kotinos (Greek: κότινος), was the prize for the winner at the ancient Olympic Games. It was an olive branch, of the wild- olive tree that grew at Olympia, intertwined to form a circle or a horse-shoe.
Who built and flew first airplane with an engine?
On December 17, 1903, Wilbur and Orville Wright made four brief flights at Kitty Hawk with their first powered aircraft. The Wright brothers had invented the first successful airplane.
How many bones does a horse have?
Generally, the horse has 205 bones (54 vertebral column, 36 ribs, 1 sternum, 34 skull, 40 front legs, 40 hindlegs). The number of tail coccygeal vertebrae is usually 18 but can also vary.
Why does the sun lighten our hair and darken our skin?
Melanin is a pigment found in your skin and hair cells that gives each its color. It does seem weird that the sun bleaches our hair and darkens our skin. This mostly has to do with hair being dead and skin being alive. The sun bleaches and destroys the melanin in your hair giving you lighter hair.
How old was Mary Queen of Scots when she became queen?
More information about: Mary, Queen of Scots. Mary was born in December 1542 in Linlithgow Palace, the only child of James V of Scotland and his French wife, Mary of Guise. When she was six days old her father died and she became queen.
Where does bubble tea come from?
This is a drink that originated in Taiwan in the 1980’s and spread throughout Southeast Asia before finding its way to the US. Most of us think of bubble tea as being synonymous with boba tapioca pearls, but bubble tea was originally just a cold milk tea that was shaken until frothy.
Can tonsils grow back after being removed?
During a tonsillectomy, most of the tonsils are removed. However, some tissue often remains, so tonsils can occasionally regenerate — although they probably won’t grow back completely or to their original size. If you’re worried that your daughter’s tonsils are growing back, talk to your doctor.