Science & Mathematics Questions & Answers

Science & Mathematics Questions & Answers

How are corrective lenses made?

The lab technician selects a lens blank that has the correct segment (called an add) and a base curve close to the prescribed power. Then to make the power match the prescription exactly, another curve is ground on the back of the lens blank. In most labs, the equipment is designed to grind minus curves, so a strong, plus lens …

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How 3-D Glasses Work?

Although the 1950s are most often considered the 3-D movie decade, the first feature length 3-D film, “The Power of Love,” was made in 1922. Since that time the use of 3-D technology in theaters and on television has drifted in and out of mainstream popularity. But, whether you’ve used them for the big screen or at home in front …

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Has the Sun stopped burning?

Believe it or not, a tank of cleaning fluid buried underground is telling us about what goes on at the center of the Sun. and the startling news is that the Sun may have stopped burning, albeit temporarily. According to theory, the nuclear reaction include the Sun should produce atomic particles known as neutrinos, which escape directly into space and …

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Hairy star terrorizes the world!

The ancient Greeks called them ‘hairy stars’. In fact, they were seeing comets-heavenly bodies with long, streaming tails that travel endlessly around the sun. Before they were understood, comets were believed to foretell plagues, war and death. A comet was seen over Rome after the murder of Julius Caesar in 44 B.C. Another, Halley’s comet, appeared over Europe in 1066, …

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Does an electric field affect plant growth?

Yes, an electric field affects plant growth. In the presence of an electric field, the height of the stem and the length of the roots are more than those without an electric field. The change in growth rate depends on electric field, temperature and humidity. Experiments show that if an electric field intensity of 25 kv/m is applied and temperature …

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Does all wine get better as it grows older?

Not necessarily. Although many types of wine, particularly red ones, improve with age, there are some which do not keep so well, and may become unpleasant if kept for too long. Also, it has became fashionable recently to drink some wines when they are ‘new’ this means that the wine has been made from grapes harvested in the same year. …

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Does a bigger brain make you smarter?

It is not the size of brain that makes one person brilliant and another dullard, for most adults have brains of the same size and weight-about 11/2 kilograms. Rather, it is the way the brain develops. Your brain stores information from your past experiences, helping you to remember, learn, and think. But people differ in how much they remember, how …

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