The inflection point was probably in late 1966 or 1967, so when Neil Armstrong flew to space on Gemini 8, plate tectonics was not widely accepted, but when he landed on the Moon three years later it was the mainstream consensus.
Many things about Star Wars were not well planned out, but having a 37-year-old in old-age makeup play the Emperor in Return of the Jedi was such an incredible call.
If you don't know where you are on Earth, the angle of satellite dishes can help constrain your latitude. If some of them are pointing straight up, you're probably near the Equator, right under the ring.
When Galileo dropped two weights from the Leaning Tower of Pisa, they put him in the history books. But when I do it, I get 'detained by security' for 'injuring several tourists.'