october 11 , 1939 entrepreneur and scientist alexander sachs gave us president franklin roosevelt a letterclear development. signatories included albert einstein and leo sillard. they warned the head of the white house that hitler's germany was trying to create a new type of super-powerful bomb. and for security reasons, we ourselves need to intensify nuclear research. soon, in 1942 , a complex of laboratories and production facilities appeared under the general name of the manhattan project. it employed 130,000 people. and after 3 years the first samples appeared american atomic bombs. the first thing. blew up during a test, here are two others, a baby and a fat man, the united states dropped on the japanese cities of hiroshima and nagasaki. on october 11, 1969, the soyuz 6 spacecraft launched , followed by two more spacecraft, soyuz 7 and 8, in the following days. thus, the first group orbital flight took place, in which three spacecraft took part at once. they spent a week in orbit, practiced hundreds of maneuvers, and carried out a lot of scientific research. during the work, they some