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“The Knowledge Library”
Knowledge for All, without Barriers…
An Initiative by: Kausik Chakraborty.
“The Knowledge Library”
Knowledge for All, without Barriers……….
Knowledge for All, without Barriers…
A camera basically consists of a lightproof box that lets in a bit of light at just the right moment. Once the light enters the camera, it creates an image by causing a chemical reaction on photo film. Of course, SLR cameras …
Science doesn’t yet have a final answer for why moths, flies, and other insects. There are several theories that might explain why certain insects seem attracted to light. Something called phototaxis explains how creatures respond to light with motion. Insects–like moths–that …
There are two main factors that help determine your eye color: the amount and pattern of dark brown pigment (called melanin) in the part of your eye called the iris and the way in which the iris scatters light that passes through the eye. The more important factor is pigment, which is determined by your genes. Deep …
When it comes to large teeth, though, one fish leads the rest. Great white sharks have large teeth, but they’re also huge fish. When tooth size is compared to head size, the Sloane’s viperfish stands out as the fish with …
The circumference of a circle is its perimeter or the length around it. The distance from the center of a circle to its edge is the radius. The distance from one side of a circle to the opposite side (twice the radius) is the diameter. Finally, the …
Getting sleepy and eventually falling asleep after reading a few pages is a phenomenon that many, if not most, of us can relate to. So what is it about reading that can make us conk out? Not everyone gets sleepy while reading and, of those who do, not …
While we usually think of bodily organs as those important parts inside our bodies, your skin is actually an organ that covers the entire outside of your body. And it’s big! If you stretched out all the skin covering a 150-pound adult, it would …
Your brain is divided into two halves called hemispheres. Many people believe that these different sides of the brain — the left and the right — control different ways of thinking. Many people also believe that each person uses one side …
Before we get to how erasers work, though, let’s learn a bit about what exactly is on the paper that you’re erasing. Although we call the black stuff in pencils “lead,” it’s not the real metal known as the lead. …
So where does such a little pepper get its big heat? The answer is capsaicin, a chemical in the pepper. When you eat a pepper, capsaicin comes in contact with pain receptors in your mouth. These pain receptors sense heat. When capsaicin activates the receptors, they send a message to the brain telling …
A 3D printer isn’t anything like a regular printer, however. Instead of printing a simple text document on a single piece of paper, 3D printers can “print” a real three-dimensional object! Sound like magic? It isn’t. It’s pure science and technology. The technology behind 3D …
Why do cats stretch so much? There are plenty of reasons. For one thing, stretching is one of the many ways cats communicate. Since cats can’t talk to us, they use body language to communicate instead. Have you ever seen a cat arch …
Antimatter costs $62.5 trillion per gram! What is antimatter? You’re not the first person to ask! In fact, people weren’t even sure antimatter existed for a long time. English scientist Paul Dirac predicted the existence of antimatter in 1928. Four years …
Ursus maritimus…that’s the Latin name of the majestic polar bear, the largest carnivore that lives on land. You’ll find polar bears in northern Greenland, Norway, Siberia, and Canada. Polar bears are among the largest land mammals on Earth. Male bears can weigh 1,700 pounds and stand eight …
Thousands, millions, and maybe even billions of years ago, extreme heat and pressure turned pure carbon into colorless diamond crystals 100 miles or more below the Earth’s surface. Diamonds are the only gemstone made of only one element: carbon. Eventually, volcanic activity …
Do you know where pearls come from? They don’t grow on trees. You can’t plant them. They aren’t mined out of the ground either. So where do pearls come from? Pearls come from a living sea creature: the oyster. These …
How Many is a Googol? What’s the biggest number you can think of? A million? A billion? A trillion? A gazillion? Infinity? Long ago, mathematicians came up with an easy way of representing very large numbers. They created exponents (also called …
It’s important to understand, though, that shots are a good thing. If you’re sick, a shot of the right medicine can help you feel better in a hurry. Other shots called “vaccinations” help keep you from getting sick. Some of the worst diseases from …