**Computing**

Online diff tool

HTTP flowchart

Astroinformatics

Python propaganda

How to safely store a password

Google Docs dropping IE6 support

Why it’s hard to move Facebook off PHP

Keyboard shortcuts for Windows, Mac, and Linux

**Math**

Fundamental examples in math

Daily fact from algebra and number theory

62nd Carnival of Mathematics

**Miscellaneous**

Always wear your seatbelt

Space shuttle repaired with duct tape (lunar rover too)

How to peel a pummelo. YouTube video with nice soundtrack.

Thank you for the seatbelt one. I had seen it mentioned before, but hadn’t yet watched it. I got tears in my eyes. It’s perfect. (I wonder if it works well for kids, too. I’d expect ads that get kids bugging their parents to wear a seatbelt to be wildly effective.)