The vs math one says it was uploaded 6 months ago, but I swear I have seen it (or I guess something similar) a longer time ago. Still cool.
I have been teaching math for 12 years now. I really enjoy it, though this year has been the exception, but not because of the kids. I recently had a former student who is now an adult come back and tell me he is going to college for aerospace engineering (I think that is what he said, something along those lines) and that I was inspiration to him for loving math.