Science & Mathematics Questions & Answers

In physics, the fifth dimension is a hypothetical extra dimension beyond the usual three spatial and one-time dimensions. Some scientists have speculated that the graviton, a particle thought to carry the force of gravity, may leak into the fifth or higher dimensions, which would explain how gravity is significantly weaker than the other three fundamental forces. M-theory (the mother of …

The Fermi Problem, named after Italian physicist Enrico Fermi, is about a formula regarding how to think about what assumptions we make, how to make them as realistic as possible, how to estimate well, and how to put all these in the service of a straightforward mathematical calculation in order to come up with an answer.

Most of the world’s electricity is generated by oil, gas and coal in power stations. These fossils fuels are being used up quickly, and some experts have predicated that an energy crisis will occur before long. At the present rates at which we are using oil and natural gas, the known reserves will run out in the early 21st century. …

Southern Arabia contains one of the world’s bleakest deserts, which is visited only by the hardiest Bedouin nomads. Like all deserts, this is a place of extremes, and they must be prepared to risk hunger and thirst, and exposure to heat by day and bitter cold by night. The region is the Rub al Khali, or the Empty Quarter. Much …

Since World War II, many countries have joined common markets. These organizations try to develop the economies of the member countries, especially by removing all trade restrictions between them. The European Economic Community (EEC) was founded in 1957 by Italy, France, Belgium, Luxembourg, the Netherlands and West Germany. Six nations joined later: Denmark. Ireland and the UK in 1973; Greece …

The E layer is a region of the ionosphere, extending from about 90-150 kilometres above the Earth, which influences long-distance communications by strongly reflecting radio waves in the 1-3 megahertz. It is also called E region, Heaviside layer, or Kennelly-Heaviside layer. This region reflects radio waves of medium wavelength and allows their reception around the surface of the Earth. The …

Christian Johan Doppler (1803-1853) was an Australian scientist born in Salzburg who made and important discovery about the effects of sound and light when the sources are moving in relation to the observer. You may find the Doppler effect easier to understand if you consider what happens to the noise of a train as it approaches you and then fades …

The charging end of the glass furnace is commonly referred to as the ‘dog house’. It comprises a tank with spaced sidewalls. The glass batch (raw material) is fed continuously into this opening – called dog house – at one end of the tank, and the melted, refined and conditioned glass is drawn out the other end.

The human brain is at the top of the head, behind the forehead. The brains of other animals are behind their faces. Compared with the brain of an animal, the human brain has became enormous and room has had to be found somewhere for it. It is the size of our brain that more than anything else distinguishes us from …

Moong bean sprouts are the young shoots of moong beans used as a vegetable. Soybean is rich in oil and protein, as compared to moong bean sprouts.