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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…
प्रतापगढ़ के एक छोटे से गांव में नंदू नाम का एक बालक अपने निर्धन माता-पिता के साथ रहता था। एक दिन दो भाई अपनी फसल शहर में बेचकर ट्रैक्टर से अपने गांव आ रहे थे। फसल बेचकर जो पैसा मिला …
एक बार दो दोस्त एक बड़ा रेगिस्तान पार कर रहे थे। रास्ते में चलते-चलते उनका किसी बात को लेकर झगड़ा हो गया और एक दोस्त ने गुस्से में आकर दुसरे दोस्त को थप्पड़ मार दिया। दूसरे दोस्त के यह बात …
️ इलेक्ट्रोलिसिस एक रासायनिक प्रतिक्रिया प्राप्त करने के लिए इलेक्ट्रोड के माध्यम से एक प्रत्यक्ष प्रवाह पारित करने की एक प्रक्रिया है। जब चुना हुआ इलेक्ट्रोलाइट ठोस अवस्था में होता है तो रासायनिक प्रतिक्रिया प्राप्त करना संभव नहीं होता है। …
At normal atmospheric temperatures and pressure, nitrogen exists as gas all around us in the atmosphere. To turn it into a liquid, it needs to be cooled to a temperature between -346º F and -320.44º F (-210º C and -195.8º …
The French emperor Napoleon III challenged the scientists of his day to invent a cheaper alternative to butter that would still be similar in appearance and taste. In 1869, French chemist Hippolyte Mège-Mouriès combined beef tallow, milk, and margaric acid …
The answer is a matter of simple science. Popcorn is a special kind of corn. Of all the types of corn, popcorn is the only variety that pops. Inside each kernel of popcorn is a tiny droplet of water surrounded by a hard shell called a hull. …
If you live in North America, you probably look forward to those long summer days when you can play outside for hours on end because the Sun doesn’t set until late in the evening. Likewise, you might dread short winter days. You …
What water does do is affect the way light bounces off of your hair. Objects have the color we see because they reflect certain wavelengths of light back to our eyes. The wavelengths correspond to particular colors. Visible light, also …
The air-breathing lungs of mammals, including humans, must be dry and empty of fluids to work properly. When we take a breath, tiny air sacs in our lungs pull oxygen out of the air and carry it to our bodies’ cells. The …
Most children will plead for extra time. Some may even try to argue with logic. After all, aren’t adults supposed to set an example for children? If adults stay up later, shouldn’t children be allowed to stay up later, too? Unfortunately for children everywhere, that logic simply doesn’t …
Grass appears green due to a pigment called chlorophyll, which is essential for photosynthesis, the process by which plants produce energy from sunlight. Here’s why grass and many other plants appear green: 1. **Chlorophyll**: Grass, like most plants, contains chlorophyll …
When honey bees sting, they release pheromones that stir up nearby bees. Often, those other bees join the attack. One stinging bee can turn into hundreds or even thousands of stinging bees in just a short time. That’s one party we don‘t …
Are our human senses not finely tuned enough to detect the rotation of Earth? Perhaps Earth doesn’t rotate fast enough to be felt by humans, who are tiny in comparison to Earth? Earth definitely rotates fast enough for humans to …
Why Swiss cheese has holes was a mystery for many years. Then, in 1912, a U.S. Department of Agriculture chemist named William Mansfield Clark published a manuscript in which he set forth his theory behind the holes in Swiss cheese. Like all cheeses, Swiss cheese is made using …
On Earth, one solar year is usually 365 days. This is the amount of time that it takes Earth to travel once around the Sun. When the Gregorian calendar was introduced in 1582, a year was defined as 365 days to make the calendar year coincide with the solar year. Long, long ago, though, smart astronomers …
If you’ve ever noticed this phenomenon, you’re not just imagining things. A part of your eye does indeed get bigger in the dark. What are we talking about? The pupil, of course! To learn why this happens, we need to know a bit more …
Memories are mental records of past events. As such, they consist of recollections of our personal experiences. Memory begins with the senses since that’s how we experience the world. If you think about it, your memories consist of remembrances of …
A Blue Moon is a rare sight. And, most of the time, it isn’t actually the color blue. A Blue Moon occurs when there are two Full Moons in one month. Full Moons happen about every 29 days. Most months have 30 or 31 days, so …