Joel Achenbach reports on science and health. He joined The Post in 1990 as staff writer. Email: joel.achenbach@washpost.com ...

I was ready to give up until someone nudged me about the Zettelkasten, a method for collecting and connecting note snippets to build a knowledge base. As it turns out, Obsidian, a popular note ...

One of the major issues with the proposed rules is the allowance of digital QR codes instead of mandatory on-package text or symbol labeling. USDA proposes to allow manufacturers to choose to use QR ...