In keeping with the science theme, we must bring to your attention a momentous event which happened on this day in 1967.
"Our World" was the first live worldwide television broadcast made possible by four telecommunications satellites and was seen by over 400 million viewers on five continents. It may seem quaint that this was such a big deal, since we can now receive live worldwide broadcasts regularly, but remember, back then TV was reserved for Walter Cronkite and The Monkees, but not together. That we know of.
The broadcast featured Franco Zeffirelli, Joan Miro, Leonard Bernstein, Marc Chagall, Van Cliburn and The Beatles, but the only portion people seem to recall now is the Beatles' performance of "All You Need is Love," which was written by John Lennon just for that occasion.
You can view it on youtube.com, or listening to a recording on the Beatles' Love CD in the Mudd.