12 September

In 1940, the paintings of the Grotte de Lascaux in southwestern France were discovered by 18-year-old Marcel Ravidat.

Above: Aurochs, horses, and deer. Lascaux Caves, France.

Also, born in 1921, Polish philosopher and author Stanisław Lem

We have no need of other worlds. We need mirrors. We don't know what to do with other worlds. A single world, our own, suffices us; but we can't accept it for what it is.

—Snaut, from Lem’s 1961 novel, Solaris