Living Mathematics. All Fun Problems

The world is full of mysteries and questions. Who could have thought that mathematics would help us understand many of them? For example, how many years does a hair live, how to read encrypted letters, and even could the Great Flood have occurred. And in fact, it is enough to be familiar with elementary arithmetic and the simplest facts from geometry to find solutions to these and many other seemingly complicated problems. How? The well-known science popularizer Yakov Perelman will show you.