You must have experienced a bad smell in butter and margarine that were not stored in a refrigerator for some time.Do you know the reason for this?
While you were enjoying flying kites,Have you ever wondered how kites fly up high in the sky ? The shape and the area of the kite greatly helps lift the kite up with the wind.You can relate this to an instance where you left your window open and uncrumpled papers flew away with the wind while crumpled papers did not .
Animals like monkeys and squirrels use their tails to maintain the balance when reaching high places.But do you know why a Kangaroos’ tail is much stronger and larger .Because a kangaroo uses its’ tail as an extra limb,creating a tripod when fighting with the others.And also this tail helps them to produce the force required to hop.
Beehive; One of nature’s wonderful creations, is produced from bee wax. Do you know that ancient people prepared sheets, made of bee wax for writing? Bee wax is stable and doesn’t react easily. Can you believe that stylus marks pressed in the wax pages that are recovered from ancient shipwrecks, can still be read after centuries on the sea floor.
Mist occurs when water vapor condense on the inner surface of the glasses of a vehicle. On rainy days the temperature outside the car is less than the temperature inside the car so the glasses of the vehicle too are cooled. When these glasses are cooled to a certain temperature the atmosphere inside the car become saturated,so the water vapor condense on it.The temperature of the glass at this time is known as ’the dew point ‘inside the car. When you turn on the air conditioner, it removes some of the water vapour inside the car and creates an unsaturated atmosphere which is why the mist on the glass disappears
Do you know why the inner surface of the glasses in a vehicle get misty on a rainy day when we are not using an air conditioner?
Do you know that the colors of flowers that we see is quite different from what insects see? Since insect eyes are sensitive to ultra violet rays, the patterns in the petals and paths to the sources of pollen and nectar that are only visible to the ultra violet light, can be clearly visualized by them.
Have you ever wondered how penguins stand on ice in very chilly climates?Penguin’s circulatory system is formed to transport heated and chilled blood in different blood vessels but these vessels run close together,however.In this way warm blood flowing downwards, warms cold blood which circulate upwards.
Have you noticed that fielders gradually pull their hands backwards with the fast moving cricket ball while catching it?The momentum (mass x velocity) of the ball that hits the bat is quiet large .when we try to catch the ball while keeping our hands still, a large force is applied on the hand by the ball. But when we pull our hands backwards in the direction of the moving ball,the difference of momentum that takes place when the ball is stopped is less;applying less force on our hands and not causing any injury.
Do you know that you had a sterilized mouth i.e.germ free, when you were born , but within a few hours after birth the first micro-organisms start to appear, when you cry, respirate and while you are breast fed.
There are so many microorganisms in and around your mouth . But do you know a period of time that your mouth had been sterilized ? And do you know the first action that caused micro-organisms to enter your mouth?
You might be surprised to hear that butterflies feed on mud puddles too. A butterfly cannot live on sugar alone; it also needs minerals. To supplement its diet of nectar, a butterfly will occasionally sip from mud puddles, which are rich in minerals and salts.
Have you ever experienced a headache while eating something cold like ice cream? When a cool substance touches the roof of your mouth, the blood vessels in this part constrict and ultimately dilate when it gets warmed up. This dilation is sensed by the pain receptors of our palate and the signals are sent to the brain by a special nerve. This nerve is responsible for sensation in the face. When these pain signals are received, the brain often interprets them as coming from the forehead and we feel it as a headache.
Do you remember once we mentioned that among the creatures in the animal kingdom the Humpback whale is the creature that can produce the loudest sound? Though Humpback whales have no vocal cords like humans do, whales generate their sound by forcing air through their massive nasal cavities.
A common cold virus attacks your throat first,and irritates it. As a result, the nerves present in the throat get exposed and irritated.Due to this reason you feel an itching sensation before you catch a common cold.
Why do you feel an itching sensation in your throat before you catch a common cold?
Why don’t we feel the sweet taste of the tea after eating too much sweets? The reason is that the taste buds of our tongue are now adapted for a high concentration of sugar so they take time to adjust to a stimulation caused by a low concentration.
Have you felt dizzy after doing spinning games with friends?Inside your ears there are tubes filled with liquid.The liquid moves when you rotate, telling your brain what position your body is in. When you spin,the liquid also spins.The liquid continues to spin even after you stop. Your brain thinks you’re still spinning, so you feel that everything is going in circles-until the liquid stops moving.
Lettuce gets brown very quickly when we prepare salads due to reactions that occur when chemicals in lettuce called polyphenols react with enzymes known as polyphenol oxidases. Normally the enzymes and the polyphenols are stored separately within a cell,but when cells are damaged, as in cutting or tearing lettuce, their contents leak out and the polyphenols and the enzymes mix with each other and produce a brown pigment;