Thanks to Bill from New York for this suggestion! Bill emailed me a problem asked in China to identify talented students. A few very talented students did solve it in less than one minute! I was not able to solve the problem at all. The question involves finding the area of a red triangle in a parallelogram, for a diagram you can see in the video. Even though I didn't solve it, I really enjoyed learning the solution.

My blog post for this video:
https://wp.me/p6aMk5r6

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My Books
"The Joy of Game Theory" shows how you can use math to outthink your competition. (rated 3.8/5 stars on 31 reviews)
http://amzn.to/1uQvA20

"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decisionmaking and offers techniques to make smart decisions. (rated 5/5 stars on 2 reviews)
http://amzn.to/1o3FaAg

"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews.
http://amzn.to/1GhUUSH

"Math Puzzles Volume 2" is a sequel book with more great problems. (rated 5/5 stars on 3 reviews)
http://amzn.to/1NKbyCs

"Math Puzzles Volume 3" is the third in the series. (rated 3.8/5 stars on 4 reviews)
http://amzn.to/1NKbGlp

"40 Paradoxes in Logic, Probability, and Game Theory" contains thoughtprovoking and counterintuitive results. (rated 4.3/5 stars on 12 reviews)
http://amzn.to/1LOCI4U

"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews)
http://amzn.to/18maAdo

"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 3 reviews)
http://amzn.to/XRm7M4