For a spacecraft to overcome the Earth’s gravity, it needs an average speed of 12 kilometers per second.
The first city in the World that has reached one million inhabitants was Rome, around 133 BC. London got its one million inhabitants in 1810, and New York in 1875. Today, there are over 300 cities with more than a million inhabitants.
Dragonfly's eyes can spot its prey from a distance of 40 meters.
On average, adults laugh fifteen times a day.
The last US state to introduce mandatory photo on the driver's license was New York, 1984.
The first ancestor of today’s horse lived 50 million years ago. It was 30 cm long and 25 cm high. It had on its front legs four fingers and on his hind legs three fingers.
