What a misery guts I am, but I just have to point out that Leonard Nimoy’s tribute from the ISS was not a Vulcan sign. The Vulcan “Live Long and Prosper” sign is always given with the thumb apart from the hand. It’s a small point but it’s significant. It’s like spelling someone’s name incorrectly, or giving a talk in a city which you then mispronounce. No one will probably say anything, but knowing looks are swapped. It was a nice gesture, but it wasn’t correct. Not on the scale of Neil Armstrong’s much-discussed omission of the word “a” (pressure? what pressure?), but still needs to be noted.
Here we have the real thing in Star Trek original and Veteran Nimoy flavors: