• An Alternator Coin Puzzle

    Updated: 2024-06-23 23:49:21
    I run a program at MIT called PRIMES STEP, where we conduct mathematical research with children in grades 6 through 9. Our first research project was about a funny coin called an alternator. This coin exists only in a mathematician’s mind as it can change weight according to its own will. When you put the […]

  • 2024 MIT Mystery Hunt

    Updated: 2024-06-19 16:26:51
    I am not as excited about the MIT Mystery Hunt as I used to be. So, for this year’s hunt, I didn’t go through all the puzzles but present here only the puzzles that were recommended to me. I start with math, logic, and CS. Then we have some word puzzles. Now, the rest. Share:

  • Calculus in Life

    Updated: 2024-06-12 15:52:22
    Here is an old joke. A former student runs into an old calculus teacher as she is shuffling home. The student is happy to see her and says, “I recently thought about you and our classes.” “How so?” she perks up. “I was in a bit of a pickle when calculus helped me,” he says. […]

  • Tesseracts and Foams

    Updated: 2024-06-10 16:57:37
    Foams are a recent craze in homology theory. I want to explain what a foam is using a tesseract as an example. Specifically, the 2D skeleton of a tesseract is a foam. We can view a tesseract as a convex hull of 16 points in 4D space with coordinates that are either 0 or 1. […]

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