In 1925 a rescue circle, equipped two auxiliary chambers, was patented in the USSR. There was water in one of them. That was in other?
Carbide.

At the beginning of 20 в. in the whole world there was a fashion on beards. Therefore the invention of Kempa Kinga Dzhileta did not have demand, and in 1903 he succeeded to sell a 51 razor and 168 blades only. What event did change a fashion cardinally, compelling the government of the USA to order him at once 3,5 million and 36 million blades machine-tools?
First world war.

Invention of Dzh. Eastman in a picture be as the offspring of Khayrema of Max on gun business. What did he invent?
Spool-type tape.

In 1892 in France 1000 patents were given out on the new constructions of this device, in England — 2400, in the USA — 4000. What device was so intensively modernized?
Bicycle.

The Japanese engineer Keydzi Kitamura invented an even not bicycle. He invented a mirror. Kitamura collected an aquarium with a three-cornered section, gap-filling water the family. Two his vertical walls were formed by ordinary mirrors, connected by at right angles catopters inward, and the third wall is transparent glass. It and served as the right side of device. What is it possible to see in such mirror?
The right-reading reflection.

In 1941 — 1945 GG- economist, academician And. And. Trakhtenberg, not having an access to the paper, was engaged in the invention of the system of rapid verbal account. And it is necessary to acknowledge, it was brilliantly succeeded to him. And why he did not have a paper.
He was in a concentration camp.

An invention which changed the system of school education in a root was done in 18 в., considerably promoting a teaching closeness. What it after an invention?
Black-board (it allowed to conduct employment simultaneously with the large number of students in a class).

What acquaintances to all of us do walls until now smear bone glue, sulfide of antimony and red phosphorus?
Match small boxes.