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Re:Richard Feynman's Blackboard at the Time of His Death (1988) by cyberax on Friday February 21, 2025 @05:26PM (#43133801)
Planck? His greatest achievements were a bit before the 20-th century.

Feynman also became active in physics right at the end of the heroic era. So he's disadvantaged by it.

Re:Richard Feynman's Blackboard at the Time of His Death (1988) by pdonis on Friday February 21, 2025 @07:27PM (#43134823)
If we're limiting to work actually done in the 20th century, yes, I agree Planck might not qualify because of the century boundary. And we also get to split hairs over whether 1900, when Planck published his quantum hypothesis, is in the 20th century or the 19th. :-)