## When was the mathematical symbol π (pi) discovered? And what are its peculiarities?

Most of us probably know “pi” as a word often used in geometry. However, what some people don’t realize is that it is actually the sixteenth letter of the ancient Greek alphabet, and it is pronounced as “pie.” For those who don’t know, the ancient Greek alphabet consists of 24 letters, with … Read more

## What are the units of measurement of light?

Apart from Kilogram, Celsius, Liter, Watt, Calorie, etc. there are many other units of measurement unknown to a layperson, mainly because they are not used in our everyday life. Experts have fixed more than 125 clearly defined units. Half a dozen of them are only for measuring the intensity of light, including … Read more

## Why ships and airplanes measure speed in nautical miles (knots) rather than miles and kilometers?

When you travel using a bike or a car, your speed is measured in miles or kilometers per hour. That unit of measurement, however, changes when you get on a ship or an airplane. These two vessels use the term ‘knot’ or nautical miles instead to determine how fast they are traveling. … Read more