9 + 10 = 21?

Kay Ngo
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Hey guys! So, I made this video to show you how to scientifically prove that 9 + 10 = 21. I know that 9 + 10 is originally 19, but I was bored again so.......yeah. If you don't know what it is then here's the link: https://www.youtube.com/watch?v=vsp18UOLveU