Science magazine for children: Packed with science stories, science facts, science features, and other science learning resources for children. Discover the known, the unknown, and little-known facts in our science articles. Learn the how and why of everyday things and explore rare and exotic living species.
358 items in this section. Displaying page 9 of 36
Why does Cutting Onions Make us Cry?
If you cut an onion, you begin crying. Have you ever wondered why this happens — why onions make tears run down your face? Well, onions contain a oil, which has lots of sulphur in it. When you cut the onion, this oil is released. It evaporates very fast. When the oil gases reach your eyes, it causes irritation and sends signals to your tear gland to produce tears. So that the tears can wash away the irritant from your eyes....
Why Does Time Start in Greenwich?
Its six in the morning and the sun is streaming through the window of your home in Delhi. In New York, people are just packing up to go home as it is six in the evening! Nothing amazing about it. We know that the earth is round and that it revolves once in 24 hours. So while it is daytime in the east, it is still night in the west. But for ages, people measured time based on the position of the sun – it was noon when the sun was highest in the sky....
The Mysterious Case of the Neem Tree
For thousands of years, the neem tree has been a familiar friend to the people of India. A native of India and Burma, every part of this tree, from its root to bark, leaves and seed, has been used for medicinal purposes. It has been used to cure illnesses. It has also been used for preventing infection, or repelling insects that attack grains or people, like mosquitoes. It is very interesting that the neem’s botanical name, Azadirachta indica, has come from a Persian description of the tree....
The Magical Rainforest
Imagine a forest where the trees touch the sky. Due to enough rainfall, the trees grow huge and spread wide. Their tallest branches are so thick-leafed that they create a thick curtain. Even the wind does not find enough space to blow as it pleases. All there is in that forest is stillness. And it is very warm. The temperature could vary between 20 and 35 degrees centigrade. The climate is such that it is good for life forms of all kinds — from trees to animals, birds and insects....
What is Daylight Saving Time?
People in some parts of the world gain an extra hour in winters and are able to sleep and snore that much longer thanks to a suggestion by Benjamin Franklin about daylight saving time. But when the suggestion was first made, it raised such a furore not only from those kept awake by the extra snoring but also from others and they wasted a lot of time fighting over this extra hour. Actually the confusion began when the postal service and the railways began to connect far-flung cities....
Why do Cats Always Land on Their Feet?
When someone falls from the fourth or fifth floor, and survives, we call it a miracle. When a cat falls from that height, we watch astonished as it lands on all fours, pauses, then straighten up and walks away looking just a little fazed. What would you call this, a miracle or God’s grace? Any guesses why cats survive while humans don’t? Well, it all has to do with the in-built ability of a cat to adjust its position during a sudden fall, its light weight and lithe muscular body....
How do Earthquakes Happen?
Simply put, the shaking of the earth caused by a sudden shifting of rocks below its surface, is called an earthquake. The earths crust or outermost layer, is not made of one single piece of solid rock. It is actually made up of independent sheets of rocks called tectonic plates. The tectonic plates of the world were mapped in the second half of the 20th century. These plates slide against each other, giving rise to physical changes in the earths topography....
Where does the Pigeon Post Operate?
Among birds, pigeons have a natural and unerring instinct of returning to their nests or homes after long flights. In the early days besides domesticating animals like the horse, dog and cow, people also bred pigeons to carry messages back and forth. These pigeons are called homing pigeons. Racing pigeons have a life span of 15-20 years. A healthy bird can fly stretches upto 1,000 km. Normally the message is tied around the feet of the pigeon in a plastic capsule to protect the paper....
What is Cloud Seeding?
There was a time when a farmer would sit out in his field, watching a lonesome cloud float away, taking with it the last hope of a much-needed burst of rain. As humans take control over more and more natural processes – not necessarily for the betterment of civilisation – rain too seems to have finally been leashed in. Just like a farmer throws seeds on ploughed land to harvest plants, clouds can also be seeded with chemicals to induce rain!...
The End of Living – The Beginning of Survival
The End of Living – The Beginning of Survival In 1854, the government of United States made an offer for a large area of Indian land and promised a ‘reservation’ for the Indian people. Chief Seattle’s reply is a most beautiful and profound statement on environment… How can you buy or sell the sky, the warmth of the land? The idea is strange to us. If we do not own the freshness of the air and the sparkle of the water, how can you buy them?...