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What is the Trail behind a Jet?

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 yell, jump up with joy, clap our hands and strain our eyes as the 'rocket' disappeared into the horizon.Soon, the white streak would change into a broken, twisted cloud path. And...

What Makes the Egg Shell so Strong?

What Makes the Egg Shell so Strong?
Have you ever wondered why hens don't break their eggs when they sit on them? The secret lies in the shape of the egg. An egg is a great example of nature's excellent skills in packing. If you squeeze the ends of an egg between the palms of your hands, it won't break. However, if you squeeze it in...

Pablo the Pigeon Painter

Pablo Diego Jose Francisco de Paula Juan Nepomuceno Maria de los Remedios Cipriano Santisma Trinidad Ruiz y Picasso. Phew! A mouthful, but a name reckoned to be among the greatest artists of the 20th century. His paintings are worth millions and millions have seen and admired his work. A handful is fortunate to own some of his paintings. He's...

Bead Calculator

November 18: Quick! Tell me what you get when you divide the number 992.587318, by 5,647.723? Stumped? Need a calculator? Well, thirteen-year-old Hiroaki Tsuchiya of Japan arrived at the answer in no time at a mental mathematics tournament in Kyoto: the right answer - 0.17575000013279688115015555826658. And, he did it without a calculator, too!Hiroaki is adept at mental arithmetic multiplying,...

Alpana

Thousands of years ago when humans did not know how to read and write he communicated by means of drawing pictures. The walls of caves where early man lived, whether it was in India or France, have been found to be full with primitive drawings. The art of alpana, practised by Indian women for centuries, is one such form...

Cap your Scissors

If you want to find your scissors just when you need them, make this sturdy case for them.The things you need:1. Any old cloth (12 inches by 16 inches) 2. A sheet of foam (half inch thickness) 3. A sewing machine4. A thick fancy cordStep 1: Fold the cloth into a quarter. Draw a triangle of base three inches and height...

Who Invented Traffic Lights?

Who Invented Traffic Lights?
Long before roads needed traffic lights, railways were using a system of signals to control train traffic. In the early railways, a single track was used for both up-going and down-going trains, and safety depended on spacing the arrival and departure of trains according to time intervals.These signals consisted of a ball and something that looked like a kite....

Signals of the Past

You want to send a message to someone. Immediately. No problem. You just pick up a land phone or a mobile phone, or send an email. The telegram is still there but many of us have forgotten about it.Now travel back in time to France, 206 years ago, when there was none of your latest technology. Not even the...

Why is it Harder to Walk Uphill?

A Himalayan sherpa porter carries a large load uphill
Raju heard the familiar cry of the ice-cream seller reach his ears, clear as a bell, even from his fourth floor apartment. He flew out of the flat and bounded down the stairs four steps at a time. The lift being under temporary repair, he had to take the stairs. He arrived downstairs a little breathless, and extremely impatient...

What is a Tornado?

A tornado is a violently rotating column of air that is in contact with both the earth and the clouds.
If you ever happen to see a dark often greenish sky, wall cloud, large hail and a loud roar similar to a freight train then run to a safe place as it could be a tornado.Popularly known as twisters, tornado is derived from Spanish word ‘Tronada’ meaning thunderstorm and ‘Tornar’ meaning to turn.A tornado is defined as a violently...

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