TIL the Apollo program is the largest ever research & development project to be executed during peacetime. It cost $25.4 billion (roughly $257 billion adjusted for inflation). At its peak, it accounted for over half of NASA'a total spending in the 1960s and employed over 400K people across the US.
https://en.wikipedia.org/wiki/Apollo_program#:~:text=%5B136%5D-,Costs,-%5Bedit%…
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