How a Jet Engine Works
When talking about jet engines, people usually mean gas turbine engines, like those used in airplanes. However, in reality, a jet engine can also refer to a rocket engine or a ship’s water jet....
Category: History
Discoveries of Archimedes
Archimedes is one of the most famous scientists not only of his era. Some of his discoveries and inventions were successfully applied by his contemporaries, while others were appreciated by humanity only hundreds or...
Squaring the Circle
There is one remarkable mathematical problem in history, which evolved from a simple mental exercise for the philosophers of ancient Greece into a very complex issue that had a significant impact on science on...
Multiplication table
Not everyone knows it, but surely everyone learns it in school. The multiplication table is a very useful thing even today in the era of artificial intelligence and calculators on phones. Who invented the...
Why is time not decimal?
Have you ever wondered why there are 60 seconds in a minute and 60 minutes in an hour? Why not 100? Why do we use the decimal system for counting, but time is measured...
Who Invented the Alphabet?
No one will argue that the invention of the alphabet is a huge step for all of humanity. After all, unlike hieroglyphs and cuneiform, writing and reading with letters became much simpler. But where...
When there were no digits?
We are so used to letters and numbers that we cannot imagine how people counted without digits. But how did people count in the good old days when digits did not yet exist? Yes,...
Ancient numeral systems
No one knows how long ago people learned to count. But we almost certainly know how they did it in the past. At least from the moment ancient numbers began to be recorded. A...
Why X is unknown in math
Everyone has somehow gotten used to the fact that in mathematical equations and in everyday life, we call something unknown X. In mathematics, x is something unknown, and not only in mathematics but also...
Is division by Zero allowed?
Why can’t you divide by zero? Who forbade it? School stubbornly forbids us from dividing by 0, but as soon as you step into university, you get an indulgence. What was considered forbidden in...
The Story of Zero
Who invented zero? For those who want a quick answer, I’ll say right away — zero was invented by Indian mathematicians. That’s what the official history of mathematics states. But for those who are...
Emperor & Imperia
The word “empire” is used by everyone, everywhere. Usually, it means “something large,” for example: business empire or criminal empire. It’s interesting what the word empire actually meant in ancient times and what the...
