Some things are pretty fast considering what they accomplished.
The Lockheed A-12 was built 2 years after its designs were approved, with 2 years before that of planning. Still the fastest air-breathing airplane in existence. Its first flight was in 1962.
In March 1940, John R. Dunning's team at Columbia University verifies Niels Bohr's hypothesis that uranium 235 is responsible for fission by slow neutrons. August 6, 1945, the first atomic nuclear bomb is dropped on Hiroshima, Japan.
During the Great Depression, in 1931, the largest dam in the world, the Hoover Dam, was built. At the time, no such large-scale uses of concrete had been proven, and it was unknown how construction could be finished in a way that would cure the concrete in time and prevent it from deteriorating. Construction was completed in 1936, over two years ahead of schedule. Testing in 1995 concluded that the dam's concrete has gotten stronger over the years.
The Lockheed A-12 was built 2 years after its designs were approved, with 2 years before that of planning. Still the fastest air-breathing airplane in existence. Its first flight was in 1962.
In March 1940, John R. Dunning's team at Columbia University verifies Niels Bohr's hypothesis that uranium 235 is responsible for fission by slow neutrons. August 6, 1945, the first atomic nuclear bomb is dropped on Hiroshima, Japan.
During the Great Depression, in 1931, the largest dam in the world, the Hoover Dam, was built. At the time, no such large-scale uses of concrete had been proven, and it was unknown how construction could be finished in a way that would cure the concrete in time and prevent it from deteriorating. Construction was completed in 1936, over two years ahead of schedule. Testing in 1995 concluded that the dam's concrete has gotten stronger over the years.