Math videos by Presh Talwalkar (studied Mathematics and Economics at Stanford). I post brain teasers, riddles, logic puzzles, viral math problems, and math topics from viewers around the world. Send me your favorite puzzles/suggestions by email: click on "for business inquiries" or visit my blog to see the address. This is the only channel to feature math topics suggested by people around the world. Support the channel on Patreon so we share the beauty of mathematics and make the world a better place: