Probably the most interesting inventions occur as they say by themselves. The well-known cellophane was obtained by accident in 1911, when a Swiss chemist wanted to invent a universal coating for tablecloths, which would not stick to stains, as a result of numerous experiments, a thin waterproof film or cellophane was obtained.
Initially, mass production of cellophane was established in France and spread around the world. In the USSR, cellophane as a packaging material came quite late, while products in paper and paper bags. Continue reading
Find old books in the attic and sell them, or buy them at random and then sell them. It sounds like a market, but still as an option :))
The cost of antique books starts from about 5000, the average price is about 50,000, so for example, “Bulletin of fine arts” — 45000r, and of course rare books, the price of which can reach millions of rubles, for example, the book of the first printer Ivan Fedorov, which remains a unit, so “Moscow Apostle” will cost about 3 million rubles. Continue reading