Useful detours.
Unnecessary problems.

K4 is the last coded message on the Kryptos sculpture, and it’s still listed as unsolved. I don’t claim an answer. Instead I check old records, rule out whole families of methods and toss out “answers” that only work because the method could fit anything.

Can an AI that learns how one person communicates help them get their meaning across, while the words stay truly theirs?

Turn good ideas into skills you can actually reach for, using practice, reflection and an app built for the hard moment.

A growing how-to guide for being a dad: connecting, talking, staying calm, making up after a rough moment, traditions and memories. All without turning family into a scorecard.

A 3D space adventure where kids about 3 to 5 count, build and play with numbers. Every instruction is spoken, and there are no timers, lives, ads or streaks.

Teacher-friendly tracing packets: paste a class roster, select dashed handwriting levels, and print one collated PDF.

Bedtime adventures you make up together. Every choice is saved, so the story world and the family’s own legends keep growing.

AI agents hunt for new math worth publishing. Examples, counterexamples and possible proofs only stay once they pass separate checks and a search shows they aren’t already known.

Computer solvers check every case of some number puzzles on networks, called graph labeling. The strongest results push the “checked up to this size” limits further for several unproved guesses about super edge-magic, odd-graceful and graceful unicyclic graphs.

A free, unofficial coach for the video game Slay the Spire 2. It works out the odds of card rewards, potion drops and card draws exactly. Everything else it labels as a rule of thumb or a computer test, never a sure thing.

Create a magical printable letter to Santa. Paste any gift link, edit its title, and make an instant QR code so family can go straight to the right product.