Do you know why lettuce gets brown very quickly when we prepare salads ?
Have you experienced an instance where your favourite cotton dress shrunk after washing? The thread of the cloth is made up of polymers. The hydrogen bonds in these polymers become stressed when the thread is pulled ,stretched andtwisted in the process of making .When you put them in the wash ,the hydrogen bonds in the polymers return to their natural, pre-stretching size.
Do you remember how you used hydrogen peroxide as an antiseptic to clean up your wounds? But have you ever thought that fresh fruits and vegetables naturally contain hydrogen peroxide in them.
Do you know that if you wear the seat belt your stopping distance is probably four or five times less than if you had no seat belt? This happens to the law of inertia .When the car stops abruptly the seat belt applies the stopping force across a large section of the body. So the damage is reduced.
Your ear gets a pain when a plane takes off, due to the difference of the pressure on the two sides of the eardrum. At the ground level, the pressure is the same on either sides of your eardrum so it does not cause a pain. But when you ascend in an airplane, the air pressure decreases, while the air trapped in your inner ear will cause your eardrums to push outward.Due to this, you will feel a discomfort and also a pain in your ears.
Why do passengers in a plane feel a pain or a block in their ear while it takes off?
Do you know why cats eat grass? It’s because to get rid from the parts that get swallowed like bones, hair balls ,fur balls etc .Though they haven’t necessary enzymes to digest cellulose ,the fibers that are contained in the grass helps to clean up the digestive system of the cat.
A karat when used with gold, is a unit of purity- 24-karat gold is pure gold. Because pure gold is too soft, it is usually mixed with a metal like copper or silver to make jewellery. Each karat indicates 1/24th of the whole.This is a solid solution of metals and it’s known as an alloy.
A passenger in a moving bus gets the same velocity as the bus. Due to this reason he loses his stability when he gets off the bus.In order to get rid of this velocity , he has to run a short distance in the same direction that the bus moves.If he jumps out & runs in the opposite direction or tries to stand still he will fall down causing serious injuries to himself.
After getting down from a moving bus ,why do people run a short distance in the same direction that the bus moves,even though it’s dangerous?
Do you know why chameleons change their body color frequently? As they are cold blooded they do this to keep the body temperature constant and also to express their feelings.
Do you know how to ripe bananas quickly? You may have experienced, when we put ripe tomatoes and raw bananas together in a paper bag it ripe so fast .This is due to a plant hormone called ethylene which produced by ripe tomatoes and it stimulates the ripping process in bananas.
Bet you didn’t know that ants can lift 50 times its’ weight. This happens due to a concept of physics known as scaling. In fact the muscles of ants are no stronger than human muscles, the ratio between their body size and body mass is very high. As a result they are able to lift weights that are many times larger than their own body weight.
When we start a car in a closed garage, it produces CO gas by incomplete combustion and CO concentration in the garage will increase within a very short period .These CO tends to bind with hemoglobin rather than oxygen .So there will be less hemoglobin to transport oxygen. Eventually people would die due to lack of oxygen.
Why does it dangerous to start a car in a closed garage?
Can you believe that drinking too much water is very dangerous for our body? It causes to make differences in body functions and sometimes it can kill people too.
Animals lick their wounds because saliva contains tissue factor which promotes the blood clotting mechanism. The enzyme lysozyme is found in saliva and is known to attack the cell walls of many bacteria,aiding in defense against infection.
Why do animals, especially some mammals lick their own wounds?
Even though people believe snake gourd is not much nutritious, it’s really a tonic for the heart. It is important in fixing problems of the blood circulatory system. Snake gourd assists encourage the creation of body fluids and reduces dryness of the body.
Have you ever seen elephants covering themselves with mud and sand? Elephants can get sunburned so they do so to protect themselves from sunburns.