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Tuesday, 19 March 2013
Saturday, 16 March 2013
When were the world fairs started?
We do not have definite information about the beginning of the fairs. But in ancient times when there were no means of communication and man had to go long distances in search of articles of daily needs, the traders used to assemble on a fixed day at a fixed place to sell articles of daily use. People used to purchase articles of their needs in exchange for animal hides or grains.With the advancement in the modes of communication, the commercial...
Do giants live on earth?
In many parts of Europe and Asia, there are legends of the existence of giants in ancient times. We also read many stories in magazines and newspapers about demons and giants. After reading these stories, one feels that giants exist in some parts of the world. Since many races of pygmies are found on earth, it is logical to think that there may be races of giants on the earth as well. In fact, giants have existed in myths and story books only. There...
What causes an echo?
When we speak loudly in a big empty hall or in a temple, we hear our own sound repeatedly. This is called echo. An echo can also be heard by shouting near a deep ditch or a well. The thunder of clouds, is another example of echo.We know that sound travels from one place to another in the form of waves. The velocity of sound in the air is (340 metres 1100 ft) per second. When we speak, the sound waves emanating from our mouth spread out in all the...
