Gifts to a Future Self

A mathematician too weak for real work after brain surgery, dealing himself hand after hand of solitaire, and a why-ladder that keeps closing on the same two answers.

Questions that Outlived the Answer

A look at how mental models work as both reasoning tools and a test for which favorite questions can accept an answer at all.

Twelve Questions, Invited in for Tea

A reflection on Feynman's practice of keeping a dozen favorite questions alive in the mind.