Superman

Superman apprehends a man who used inferior materials in construction of a subway, leading to deaths. Superman is the captured–briefly–by the Ultra-Humanite, who escapes from Superman once again.

Zatara and the Fountain of Youth

Zatara has no compunction in intimidating the natives into serving him–he's a proper gentleman adventurer, after all. And weren't they right to wish to avoid going down that river?

Anyway, Zatara is hired to find the fountain of youth by a wealthy industrialist, succeeds, and returns to find that, ironically, the man died on the very same day–at the very same hour–that they filled a flask with water from the fountain of youth. But Zatara reckons living forever wouldn't be so hot, anyway, so it's all for the best. Easy for him to say–he hasn't died of old age while waiting for some water.