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Why do Plants Lean Toward Sunlight?
Plants kept inside a room always grow in the direction of the window. In woodlands where there is a thick canopy of trees and sunlight rarely falls on earth, very few plants survive. Those that do, do not require sunlight to make their food. People have long wondered about this phenomenon until the answer was discovered and explained by the English naturalist Charles Darwin. He demonstrated that the growing shoot of a grass seedling always bends towards light....
Why does Cola Fizz?
Switch on the television and you are bound to see some cola advertisements. Aamir Khan, a Bollywood hero, pops open a cola and the bubbly drink fizzes to the top. Have you ever wondered what causes the countless teeny bubbles in all these soft drinks? Soft drinks are carbonated, i.e. carbon dioxide gas is dissolved in the liquid. This gas gives the drink its sparkle and tangy taste, and prevents it from spoiling (the gas reduces bacterial growth)....
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....
Who stole the Candle Wax?
On every Diwali, known as the festival of lights, our family has a big discussion on the kind of lighting we should have. And after talking about candles or electric bulbs we invariably choose the _diya_s or earthen lamps for their beautiful flames. But last year, we reached the kumhara or potter’s roadside shop a bit too late. The lamps had been sold out and the potter had a big smile on his face. So we decided to light candles....
What is Asthma?
Asthma is one of the most common diseases affecting the lungs. A serious disease, it affects all races and both sexes equally. This disease affects millions. Many of us recognize asthma symptoms like wheezing, chest tightness and gasping for breath. However, few of us know what is going on inside the body of a person with asthma. When we breathe, we inhale oxygen through the nose and mouth. The air passes down the trachea or windpipe through the two bronchi that branch off into the millions of tiny airways that make up the lungs....
Dangerous Red Tide in HongKong
Sea beaches around HongKong have a problem. They regularly face the threat of a ‘Red Tide’. The ‘Red Tide’ kills fish in sea farms and in the open seas. Actually, the ‘Red Tide’ is reddish brown algae that floats on water near the coastline. It enters the gills of the fish swimming about in the sea and kills them. The gills are like noses of the fish. They help the fish breathe. When the algae enters the gills, it creates havoc....
Medical Research : Location, Mt. Everest
Where: London, United Kingdom January 10, 2009 : An interesting story by BBC News tells how a team of London doctors, including five anesthetists, two general practitioners and a vascular surgeon climbed Mt. Everest. They then treated themselves as guinea pigs to measure oxygen levels present in their blood at the summit. The readings confirmed that high-altitude climbers have extremely low levels of oxygen in their blood. At sea-level these would only be seen in patients who were close to death....
Trapped
Where: Russia August 19, 2000: The Kursk, an ultra-modern Russian nuclear-powered submarine has sunk. Its crew has been trapped underwater for over a week now. In fact many might already be dead. By denying that it was a serious accident and by not launching serious rescue efforts in the beginning, the Russian government has reduced their chances of survival further… The submarine’s ability to stay for long periods underwater, is an absolute marvel of science. Actually, this is due to its capsule-like body....
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