Those who do not learn from history and the history of science might not have a third chance to do it:

“One had hoped that the 1950s dream of using nuclear energy to power everything had been put to bed. Putin’s new weapons and NASA’s talk of using nuclear reactors to power spacecraft suggest some of those dreams are being revisited. This Pandora’s box does seem to have been opened again on both sides, and all of the old objections as to why you would not want to put nuclear reactors on high-speed vehicles that you’d launch into space still apply. There seems to be a collective amnesia—policy makers and the public have to relearn lessons learned a long time ago.”