What is the Trail behind a Jet?
When we were small, we used to look up to the sky and often see a white trail left by a jet aircraft. Rocket! Rocket! We used to …
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Ajay Dasgupta
All features, stories and articles authored by: Ajay Dasgupta
54 items · page 3 of 5
Why do Airplanes have Wings?
I remember my trip to Goa. The flight was scheduled for six a.m. As the aeroplane taxied on the runway it gained speed. I felt a …
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What is the Secret of the Windmill?
It was a particularly windy day in late July when my cousin and I sat down to make a pinwheel. The paper was folded into a wheel, …
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What is Ham Radio?
Consider this, your state has been hit by a cyclone with wind speeds measuring 300 kilometres per hour. All modern means of …
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How do Animals Communicate?
Humans have invented new and advanced ways of communicating with each other. Television, radio, telephones and of course email. …
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Do Whales and Dolphins see Blue?
Dolphins and whales live in the deep blue sea, but strangely these animals are not able to see the colour blue! Leo Peichl of the …
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Why is the Ball-point Pen Called So?
Writing is one of the most important inventions. Humans first used brushes for writing, then thick reeds were used. Feathers were …
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Everything is made of something
How do you make tea? Simple, put a teaspoon of tea into a boiling cup of water. Strain the water, pour some milk and sugar to …
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What were the Voyager Missions?
Imagine a journey that takes you a billion kilometres away from earth, to the edge of the solar system, from where you can look …
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How Will our Sun Die?
Everything that is born must die. Not only living beings, but inanimate objects like stars too. The birth of a star The universe …
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All Human History is Just 10 Seconds Old!
Look at the dial of a clock. Imagine that the 12 hours showing on the dial are equal to earth’s history of four-and-a-half …
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Why does a Cricket Ball Swing?
How many times have all of us heard that the former captain of the Indian cricket team, Kapil Dev, was one of the greatest …
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