Bats are the only mammals in the animal world that are capable of flying. Do you know why they hang upside down when they rest?
Seashells that are made of calcium carbonate get their beautiful patterns due to impurities like metabolic waste products that are present when the shell is being formed. Even what these little animals eat, affect the colours of their shells. If the pigment is secreted continuously, it creates a spiral or radial band but if it is periodic the shell develops spots or flecks.
Did you know that like skin colour, the colour of your eyes too is determined by the content of Melanin?
Variation in the colours of our eyes depends on the amount of melanin in the iris, which in turn is determined genetically. Lots of melanin in the iris gives black or brown eyes and less melanin gives green. Little or no melanin in the iris gives blue eyes.
Suction cups are one of the simple useful objects that are used everyday .Do you know that they work with the help of air pressure? When you push a suction cup on to a surface ,you force nearly all the air out of it, leaving a partial vacuum inside. The much greater pressure of the air outside will hold the sucker to the surface.
A mosquito pierces your skin and releases its saliva which contains a substance that keeps blood flowing into the wound.
Your immune system detects the presence of the mosquito saliva and produces a substance called histamine to fight it.
The histamine causes the blood vessels on the wound to swell which irritates the nerves in that area .Your body feels this
nerve irritation as an itching sensation.
Mosquitoes are one of the types of insects that are disliked by many. Do you know what causes mosquito bites to itch?
Cotton can absorb up to 27 times its own weight in liquid water. Do you know why cotton is that much absorbent? Cotton is made of cellulose that has a structure which consists of a long chain of molecules. The structure of a cellulose molecule has oxygen/hydrogen groups on its outer edge. These clusters are negatively charged and attract water molecules
that have both positive and negatively charged ends (dipolar).
Tigers not only have stripes on their fur, they also have them on their skin .The stripes on each tiger are unique, like human fingerprints.
Would you like to know how X-ray images are made?. The soft tissues in your body do not absorb X-ray that well .So X-rays pass through soft tissue such as skin rather easily . Your bones are made up of calcium which are better at absorbing X-rays.So X-rays do not pass through them easily. The X-ray picture that you see is made ,using the pattern of X-ray light that passes all the way through your body.
When the meteor hits the atmosphere,the air in front of it compresses incredibly quickly.When a gas is compressed, its temperature rises.
Also, when the meteor collides with the air molecules in the atmosphere, the friction created also generates a certain amount of heat.
This causes the meteor to heat up so much that it glows.
You must’ve seen many tiny meteors falling down in the night sky .But Do you know why they burn?
The pearl oyster has an organ called the mantle that secretes proteinous organic material that forms shells. When a foreign substance slips into the oyster between the mantle and the shell, the mantle gets irritated. The oyster’s natural reaction is to cover up that irritant to protect itself. The mantle covers the irritant with layers of the same substance that is used to create the shell which eventually forms a pearl
Do you know how geckos let their tails fall off when they’re grabbed by predators? They are designed to do this, with a special tissue in the tail that creates a “weak spot” where the tail breaks off readily when the tail muscle is twisted.
Nerves and muscles in the shed tail, keep it twitching to divert the predator so the gecko can escape.
A spider’s ability to protect its web from predators has inspired the development of window glass that prevents birds from striking it. The glass has a unique ultraviolet-reflective coating that appears almost transparent to humans but is clearly perceptible to birds. The coating mimics the reflectivity and patterns of spider silk and this reduces bird collisions to a great extent.
The sense of taste is identified by our brain with the help of our sense of smell.When you have a cold, your nose tends to get congested with mucous. So, air stops flowing past the olfactory receptors,which means that odour compounds cannot reach them and your sense of smell will not work.Thus, your brain receives no signal identifying the odour, and your sense of taste is altered.
Why is our sense of taste altered when we have a cold?
Do you know why eggshells of some birds are patterned?
A new study shows that eggshells act like a ‘sunblock’,becoming pigmented to get the necessary amount of UV light and stop the excess UV light from harming the developing embryo.
Can you believe that you only have less than half of the number muscles that a caterpillar has? Humans only have around 700 muscles while caterpillars have about 2000 muscles which help their complex and unique way of moving.
The beautiful wings of the butterfly has inspired a new display solution known as ‘Mirasol’ displays.The wings of some butterflies have tiny nano structures that reflect light at different angles, causing light waves to interfere with one another, which we see as changing or iridescent colors.
This technology is used to produce reflective displays that are readable in sunlight ,requiring no illumination or backlighting, resulting in significant energy saving.
Cats have a unique skeletal structure consisting of no collarbone and an unusually flexible backbone.
For these reasons, cats have free movement of their front legs and they can easily bend and rotate their bodies. During a free fall,most of the times, a cat would adjust itself to land feet first while their feet and legs can cushion the impact.
Why do cats always land on their feet?