How is plastic shaped? Plastic is shaped in many ways. The liquid can be pushed through a nozzle to form sheets, tubes and fibres. Molten plastic may be poured into moulds. More complicated shapes can be made through vacuum farming. In this process, a sheet...
Do robots have uses in industry? Robots are used to handle dangerous chemicals. They are also used in the manufacturing industry. Assembly line manufacturing can involve tedious tasks. Such tasks can be handled by specialist robots which perform only one task. But they still need...
Who are aborigines? Aborigines are the people who have been inhabiting a place before any others arrived there. The word is derived from the Latin aborigine meaning ‘from the beginning’. Roman writers were the first to use the word. The most well-known aborigines in the...
Which snake writes in the sand? In the desert regions of the United States, one can find a snake called the side winding viper. This snake moves along by pushing its body sideways against the sand. When it moves in this manner, it leaves a...
Do fish go to sleep? Fish go to sleep, or rather a state similar to it, with their eyes open. Their eyes remain open as they have no eyelids. Some fish rest while afloat on the water while others rest on the bottom. They may...
Why do astronauts wear spacesuits? Space is not like earth. It is a place that is filled with danger. Spacesuits protect astronauts from harm when they are outside the spacecraft. Also, space is airless. Spacesuits provide astronauts with air to breathe. It also protects them...
Why does the sun have spots on it? The sun’s surface is very hot. In fact, it is 15 times hotter than boiling water. But some parts of the sun’s surface are cooler than other parts. The cooler parts seem darker than the rest of...
Why does Venice have canals? Venice is situated on a group of mud banks. These mud banks fonned more than 100 small islands at the head of the Adriatic Sea. The buildings in Venice are erected on pilings driven into the mud. In between the...
Who discovered atoms? John Dalton, an English chemist of the early 19th century, was the first man to come out with a scientific atomic theory. He found that elements are made of small particles called atoms. Later, Ernest Rutherford developed the idea of a solar-system...
What in the soil makes plants grow? The organic matter in soil comprises living things and their remains. The inorganic matter comprises minerals and rock particles. Humus, or decaying organic matter, allows more air and water to enter the soil. Dead organic matter also provides...
