A. Lurker wrote:
The Natural Philosopher wrote hastily:

Its more fairy dust mate. Forget it.

Heavier-than-air flying machines are impossible.
Lord Kelvin, ca. 1895

There is not the slightest indication that [nuclear energy] will ever be obtainable.
Albert Einstein, 1932.

Mark my words that boy will hang.
My headmaster c1960.

Bill