Per request of some subscribers, I'm going to split off a new channel called "David Metzler's High School Channel" for my highschool (and beginning college) level videos. (That includes, for example, Number Theory and Multivariable Calculus.) Please subscribe to that new channel if you want to keep seeing notifications about those videos. If you are only interested in the more advanced and/or general audience videos such as Ridculously Huge Numbers or Millennium Prizes, just stay with this channel. Thanks for your support!