Because of the scorching sun, the fan is surely your best friend these days! Well, have you noticed that even after it is switched off, the blades of the fan keep rotating for some time? Do you know the reason for this?
Scientists have found that some bacteria in our mouth have been acting as “teeth-guards”! The bacteria, which is known as A12, fight with harmful bacteria which cause tooth decay. Also, they produce an amino acid called “arginine” which neutralises acids (acids also cause tooth decay). Hopefully in future, scientists might be able to introduce this bacteria into toothpaste and even chewing gum.
Did you know that the patterned cuts in tyres are the reason we can drive safely under wet conditions? On rainy days, water gets in between tyres and the road, reducing friction. This makes the vehicle slide dangerously. But, if a tyre has patterns of cuts in it, the movements of the tyre make water flow through its narrow channels and then pushes the water out. Then the tyres get in contact with the road again.
If you wanted to discover medicinal plants, finding a particular plant through the enormous variety of plants would be like “finding a needle in a hay stack”. Fortunately, researchers have discovered that chimpanzees have done that job for us. For example, trees from the Vernonia genus are a chimpanzee remedy for parasites.
The roots of plants also have to breathe oxygen to stay alive. They get oxygen from pore spaces in soil. Too much rain will displace the oxygen in pore spaces with water. Since oxygen diffuses through water much more slowly than through well-drained soil, plant roots start to suffocate. Making matters worse, wet weather encourages harmful bacteria and fungus growth.
Did you know that excessive rain could be deadly for plants? Even watering your plants too much is harmful! Can you explain why?
Sometimes when water is poured from a glass, it travels down the side of the glass. This is because, water molecules like to make intermolecular bonds with glass (water likes to keep-in-touch with glass). To avoid this spilling, jugs have a pointed area in the opening. As water gets a higher speed when it reaches the “narrow” point, the momentum of the water will pull it free from the attraction of the glass surface and pour without spilling.
Stand up and close your eyes. Hold your arms out straight to the front. How did you feel the position of your arms and legs, body and head? Hundreds of micro-sensors in your muscles and joints detect the various amounts of stretch and strain in them. So, you get an inner sense of posture.
Did you know that if two ships move parallel to each other in the same direction side by side, they could collide? As there is only a short distance between the ships, water would flow quickly between them. As Bernoulli’s principle explains, when the speed of water gets higher the pressure gets lower. So, the space between the ships experiences less pressure than the outer sides of the ships. So, water applies inward forces on both ships which could make them collide or just “hug” each other.
Upcoming New Year season is full with deep fried sweets, oil cakes and various fried dishes. Normally house wives do reusing of oil in an economizing manner. But have you ever heard that using same oil again and again is caused for producing free radicals and toxins? They are carcinogenic and caused for heart diseases, cancer & different allergies. Therefore it is wiseful to use pure coconut oil for deep frying, not over heating oil and replacing oil if it has become darker in color or produce smoke in lower temperature than in normal. Then you can prepare tastier and healthier foods for this festival.
Do you know how some clock dials, toys and paints glow in the dark? The glow is caused by special substances called phosphors. When phosphors are exposed to light, electrons in them absorb the energy of light. When darkness arrives those electrons give out their extra energy at a lower intensity for up to several hours.
Speed gets you in trouble.Specially when policemen detect the speed you were driving.They use a handheld radar gun to detect the speed of the vehicle.The gun sends out microwaves at a particular frequency. When these waves hit a moving vehicle, they get reflected with a slight shift in frequency. This is known as the Doppler effect. The device uses the difference between the emitted frequency and the reflected frequency and determines the speed of the vehicle.
Elephants have an amazing sense of smell. They can smell water (surface water) up to several miles away! Key to this ability are the millions of chemical and olfactory receptor cells housed in the animal’s upper nasal cavity.
The glass bottle explodes because water expands when it freezes. Normally liquids decrease in volume when they become solids but water is an exception. As water gains volume when freezing, it applies pressure on the walls of the sealed glass bottle. When the glass bottle can’t take any more pressure it shatters into pieces.
Imagine that you put a sealed glass bottle filled with water in the freezer. By the next day the glass bottle would explode. Can you explain why it explodes?