What Scoop 7 brought back mutated into the Omega Man virus, which humanity to try to stop using nukes which exterminated most homo-sapiens and destroyed the biosphere (motivating the launch of the Ark dome ships which were self-destructed except one which went Silent Running out past Saturn) while hopping up ape intelligence leading to the Planet of the Apes.
It's all right there on film prior to 1972, man...
Frowning takes 68 muscles.
Smiling takes 6.
Pulling this trigger takes 2.
I'm lazy.