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How does a Nuclear Bomb differ from a Conventional Bomb?
Every now and then we hear of countries of the world carrying out heated discussions about nuclear bombs. The topics range from who has the right to own a nuclear bomb and who does not, who should use it and who must not and so on. But what exactly happens when such a bomb actually explodes? And how are nuclear bombs different from conventional bombs? The greatest difference between the two types of bombs is the sheer scale of destruction they cause....
How Wool Came Into Existence
It must have been a very intelligent human who looked at a sheep walking past and thought of the use its fleece might have! Although the oldest surviving textile made out of wool is around 3,500 years old, the oldest fine woolen fabric dates to the fifth century BC (about 2,500 years ago) and was found in an ancient Greek colony. How Wool Came Into Existence Wool was probably the first fiber to be woven into a textile....
How Does Ice float?
A cool glass of water topped with huge chunks of ice is sure to quench your thirst on a hot summer day. But, before you guzzle the water, look at how the ice floats on the water surface. How do these large ice pieces manage to stay afloat? Ice floats because it is less dense than water. (If you take a one-litre container with ice and weigh it, it will be lighter than a similar container with water....
How Far Away are the Stars?
The sun is a star, just like the thousands of others we see in the sky each night. But it looks so very big. Is it the biggest star? No. The only reason the sun appears so big is because it is closer to us than any other star. The sun is just 93,000,000 miles (or 14,88,000,000 km) away from the earth. That seems an awful lot of distance, but light can travel so quickly that the sun’s rays reach the earth in a little more than eight minutes!...
How Does Satellite TV Work?
Nine ‘o’ clock. It’s time for your favourite serial on television. Have you ever wondered how the same serial can be viewed by millions of people across the world? This is possible because of satellite television technology. It uses man-made or artificial satellites to send your favourite serial to your television set. But why do we need satellites for this purpose? How Does Satellite TV Work? The earth is round To understand this, we have to first take a look at the shape of our earth....
How do Satellites Stay Up?
Satellites orbit the earth because of the force of gravity. To understand why this happens and why the satellite does not get pulled in and fall, we have to understand what forces do. A force will change the motion of an object; it might speed it up, slow it down or change its direction. For example, if you are running and someone pushes you from behind, you speed up (the force is in the direction of your motion)....
How does a Submarine Work?
Jules Verne in his science fiction, 20,000 Leagues under the Sea, mentions a ship, Nautilus, which could dive beneath the waves and surface again when it wanted to. Even before submarines were thought about, Verne had created the blueprint of this technological marvel. Not only did he describe the machine, but he also explained, in great detail, how it worked. In fact, today’s submarines use exactly the same technology as Verne’s Nautilus did! How does a Submarine Work?...
How can We Use Water to run Cars?
Huge amounts of polluting gases are being released into the earth’s atmosphere by the large scale burning of fossil fuels or natural fuels found under the earth. These gases are the main culprits behind the phenomenon of global warming and other climatic changes. In order to find cleaner fuels, scientists around the world are trying to find a fuel or source of energy which produces little or no pollution on being burnt. Quite amazingly, a new technology points out that water can be used to generate electricity....
How did Christianity Come to India?
Would you doubt my word if I say that Doubting Thomas, one of the Apostles of Christ visited India and established Christianity? Don’t. For its true. Among Christ’s 12 apostles, Thomas Didaemus or Doubting Thomas, along with Peter and Paul were pre-eminent. Thomas Didaemus was called Doubting Thomas because he doubted Christ’s word that on the third day after his crucifixion, Christ would rise again. There are many schools of thought as to how Christianity spread in India....
How are Stars Named?
Till now we have only seen roads, railway stations, airports, places etc. being named after famous people. But imagine paying money to get a star named after you. If that can happen, then anything is possible in this world! Well, there are organisations in different parts of the world that sell names for the stars in the sky. All you have to do is – go there, fill out the long, detailed form that they give you and buy star names or name stars after someone....
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