Sometimes we at mental_floss make mistakes, or just don’t get all the facts. Over at the magazine we call ‘em “mental flaws.” Whelp, here now is, perhaps, our first mental flog (that would be a blogging flaw):

Yesterday I pontificated thusly: “Not sure how one can pinpoint the exact 50-year anniversary of our illustrious Interstate system, but today seems to be the day.”

Insert foot in keyboard, as we skip to today where I luckily discovered this fact via The Christian Science Monitor:

“On June 29, 1956, President Eisenhower signed a bill to build the Interstate Highway System — a dream of his since he crossed the US in 1919…”

And so that’s why yesterday was the 50-year anniversary, and, more to the point, why I hang my head in shame today.