This magic rubbish bin operates according to modular arithmetic.

When you see things that aren't there it's called hallucination. But when you see the *right* things that aren't there it's called mathematics. For a fun example read my new Mathematical Enchantments essay "Math and the Museum": mathenchant.wordpress.com/2025/05/21/mat…

"Remembering Kelly" recounts two stories I heard from David C. Kelly, who unfortunately passed away last week. mathenchant.wordpress.com/2025/06/17/rem…

Bought one. Couldn’t finish it.

Learn about the world of q-deformed numbers, in which 1.1 (aka 11/10), 1.01, 1.001, ... converge to 1 but .9, .99, .999, ... converge to 1's "evil twin", in my latest Mathematical Enchantments essay: mathenchant.wordpress.com/2025/07/17/whe…

I want to support public media in underserved areas of the U.S. Is there a fund that will spend my donation where it will do the most good? nytimes.com/2025/07/16/opi…

I’m disappointed to learn that “hypergamy” refers to nothing more interesting than what used to be called “gold-digging”. I was hoping it referred to something more genuinely mind-bending, like being married to uncountably many people along uncountably many timelines.

What? No “Decolonize Catan” bumper stickers for sale? Shame on you, Internet!

Have you ever seen balls ricochet down a network and land in bins to create not the usual bell-shaped curve but a curve with two humps or more? Soon you'll be able to at MoMath. mathenchant.wordpress.com/2025/08/23/ran…

A triple negative in the headlines today: “Court lifts immigration stop limits”

This month in Mathematical Enchantments: An 87-year-old fractal wanted to be seen and understood. I figured it could use some help. mathenchant.wordpress.com/2025/10/18/pic…

This just opened near me, and not a moment too soon. I really could use a few extra terabytes of RAM between my ears.

Writing in The New Yorker earlier this month, Stephen Witt said matrix multiplication is ugly. Is he right? Check out my take at mathenchant.wordpress.com/2025/11/21/is-…