This visionary speech that Richard Feynman gave on December 29th, 1959, at the annual meeting of the American Physical Society at the California Institute of Technology helped give birth to the now exploding field of nanotechnology.
I imagine experimental physicists must often look with envy at men like Kamerlingh Onnes, who discovered a field like low temperature, which seems to be bottomless and in which one can go down and down.
Such a man is then a leader and has some temporary monopoly in a scientific adventure. Percy Bridgman, in designing a way to obtain higher pressures, opened up another new field and was able to move into it and to lead us all along. The development of ever higher vacuum was a continuing development of the same kind.