When was nitroglycerin invented?

When was nitroglycerin invented?

The Italian chemist Ascanio Sobrero first made nitroglycerin in 1847, by adding glycerol to a mixture of concentrated nitric and sulfuric acids. Sobrero’s face was badly scarred due to an explosion in the 1840s.

How long was a Roman mile?

The Romans used a unit of distance called the mille passum, which literally translated into “a thousand paces.” Since each pace was considered to be five Roman feet—which were a bit shorter than our modern feet—the mile ended up being 5,000 Roman feet, or roughly 4,850 of our modern feet.

Where did hieroglyphics develop?

The hieroglyphic system used in ancient Egypt had between 700 and 800 basic symbols, called glyphs. This number grew in the last centuries of ancient Egyptian civilization, because of an increased interest in writing religious texts.

How many miles can a car go on empty?

A gas-guzzling Ford Excursion can drive an average of 85 miles after the fuel light comes on. A hybrid Toyota Prius, however, can only squeeze an extra 55 miles out of its tank. A Honda Civic can get an extra 44 miles on empty while a Toyota Corolla gets an average of 47 miles on empty.

Where is the biggest tree in the world?

The General Sherman is a giant sequoia (Sequoiadendron giganteum) tree located in the Giant Forest of Sequoia National Park in Tulare County, in the U.S. state of California. By volume, it is the largest known living single stem tree on earth.

What do penguins drink?

When ashore they will drink fresh water from pools and streams and can sometimes be seen drinking water preened off their backs during rain showers. At sea penguins must drink salt water and they are able to do this because they have special glands abound the eye sockets that extract excess salt from the blood.

Who created the sculpture The Thinker?

The Thinker – Wikipedia, the free encyclopedia. The Thinker. The Thinker (French: Le Penseur) is a bronze sculpture by Auguste Rodin, usually placed on a stone pedestal.

Who coined the term conspicuous consumption?

The American economist and sociologist Thorstein Veblen coined the term in his book The Theory of the Leisure Class (1899). The concept of conspicuous consumption can be illustrated by considering the motivation to drive a luxury car rather than an economy car.