Category: Important Questions
When was the washing machine invented? The first washing machine was invented in 1782. It was a wooden tub filled with hot soapy water. In the 1800s, machines had …
When is a dog really a cat? A prairie dog is actually not a dog at all. Infact, it is a type of rodent and lives in North America. …
When do things boil? Things boil from liquid to gas when they reach their boiling point, which is the maximum temperature a liquid can reach. For water it is …
When did the second world war end? In the second world war, Japan was the strongest ally of Adolf Hitler, the ruler of Nazi Germany. Hitler’s invasion of European …
When did Magellan sailed round the world? The first world trip was made by sailors in the ship ‘Vittoria’, owned by Ferdinand Magellan, a portugese explorer. In 1519, he …
When did people start to read and write? About 5,200 years ago, the Sumerians were the first people to invent writing. They drew picture symbols of goods bought and …
When do the stars die? The stars die when they have exhausted their vast supply of nuclear fuel. When the hydrogen runs out, they switch to helium. When the …
When did the use of antiseptics start first? At Until the 1860s, patients who had operations often suffered it and died. It was because their wounds got infected with …
