Quanta Magazine recently published a nice description of the decades-old “happy ending” problem: https://www.quantamagazine.org/a-puzzle-of-clever-connections-nears-a-happy-end-20170530/
Watch a musician play the world’s largest instrument, an organ built by a Pentagon mathematician in Luray Caverns, Virginia. (This was a favorite destination of mine when I was a boy.)
TED-Ed made a very good video describing the Infinite Hotel Paradox, a thought experiment to describe how injective (one-to-one) functions can be used to examine countably infinite sets.
From Kirk Cousins, quarterback of the Washington Redskins:
Sometimes our guests ask why I have this hanging above my desk. It’s an old high school math quiz when I didn’t study at all and got a C+… just a subtle reminder to me of the importance of preparation. If I don’t prepare I get C’s!
I’m doing something that I should have done a long time ago: collecting a series of posts into one single post. The following links comprised my series on the 2016 Pizza Hut Pi Day Challenge.
Part 1: Statement of the problem.
Part 2: Using the divisibility rules for 1, 5, 9, 10 to reduce the number of possibilities from 3,628,800 to 40,320.
Part 3: Using the divisibility rule for 2 to reduce the number of possibilities to 576.
Part 4: Using the divisibility rule for 3 to reduce the number of possibilities to 192.
Part 5: Using the divisibility rule for 4 to reduce the number of possibilities to 96.
Part 6: Using the divisibility rule for 8 to reduce the number of possibilities to 24.
Part 7: Reusing the divisibility rule for 3 to reduce the number of possibilities to 10.
Part 8: Dividing by 7 to find the answer.