When the world seems dark, I remind myself that Mister Rogers once got a letter from a blind girl, who wrote that she had heard him say he owned fish, but she worried they weren't being fed. So at the end of every following show, he'd narrate "I'm feeding the fish" just for her.
Terry Fox, a cancer patient who ran 3,339 miles across Canada in just 143 days before dying. The purpose of his career was to collect donations for cancer research. As a result, more than 24 million was raised.