Today I learned

created 2026-04-10 · modified 2026-04-12

• 2026-04-10: You can use pdfbook2 to generate a booklet. It defaults to long-edge, but you can use -s or --short-edge. Also, I the default paper format is letter, you can use --paper=a4paper. It is installed by default by texlive/mactex, but it is available also on GitHub.
• 2025-10-23: Ball pits for kid were invented by/for Ikea source: Who First Invented the Ball Pit? Two Young Ikea Designers, in 1970