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.
The longest border in the world is the one that separates Canada and the United States; a length of 6,416 kilometers.
In the Middle Ages, all believed as did Aristotle, that the heart is the center of intelligence.
On average, adults laugh fifteen times a day.
The museum dedicated to skyscrapers is located in New York.
Snake venom is dangerous only if it gets into the bloodstream. If ingested it is metabolized in the intestines and becomes harmless. Therefore, in Vietnam and Thailand, where they eat poisonous snakes, the rattlesnake is highly desirable.
