Superman #224

Few covers from 1970 capture Silver Age DC's gleeful absurdity quite like this one. Penciled by Curt Swan and inked by Jack Abel, the cover shows a bald, super-intelligent infant perched atop a chalkboard filled with advanced equations, smugly lecturing a kneeling Superman about gravity, space, and time — while a woman looks on in the background and alphabet blocks are scattered across the floor. The story title "Beware the Super-Genius Baby!" promises exactly the kind of delightfully off-the-wall premise that made this era of Superman comics so endlessly entertaining.