Holly shit. This meme has been sent and resent between me and my friends for over 10 years and none of us has ever noticed the notch.
My bad, but I guess I won’t have bad luck
Every base has a 10. Base 4 numbering goes 1, 2, 3, 10, 11, 12, 20 etc…
Depends on the age. Fully grown ones can weigh a lot more than 10kg. Source
If adobe had bought them out they would have destroyed it by now.
WHAT
Just something funny, no special meaning