A viral image that's been circulating around the Internet recently is hardly new—in fact, it's 66 years old. But it's as relevant now as it's ever been.

The image is a public service poster intended for American schools, featuring Superman lecturing a group of well-scrubbed young people about what it truly means to be "all American." And although the presentation may be corny in a uniquely baby boom way, the message is surprisingly progressive. And it's one that many people in 2015 still haven't learned.

Sources: Reddit: empathyx | h/t The Huffington Post