It is not impossible to lick your elbow. If you were to dislocate your shoulder, it's not only possible, but easy.
Everyone knows why a ducks quack doesn't echo, the reason is Ross Tokely.
Ethernet used to be a trademark of Xerox and Unix is a registered trademark of The Open Group.
The first man-made element was not Plutonium it was Technetium in 1939, 3 years before enough Plutonium was isolated to study it. Plutonium isn't even man-made!
While I'm sure many of the facts are... well... fact, given some of the corrections I've made I think there are many more in there that are not true at all.