wikipedia.org

9YD4B TIL Quine is a self-reproducing program, where it has no input, but its output is an exact copy of itself.
0wQvM TIL that the superstitious tradition of knocking on wood for good luck is believed to have been conceived by ancient Indo-European people who believed that spirits (both good and bad) lived within the trees. By knocking on a tree one was asking for a blessing from the spirit which lived within.
LkeWv TIL Nicolas Flamel was a real guy, not just a Harry Potter character.