Why is it dangerous to drink water from unkown sources? Explain.

Water can Carry different diseases and could have algae in it which is not good for the human body

It makes up an community

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11