flexbox in 5 minutes A really handy interactive intro to flexbox. Playing around with the properties and immediately seeing the result is a real help.
Password Masking A great investigation into the usability benefits of allowing users to fill in their passwords in plain text. Major caveat: make sure you still offer the ability to mask passwords too.
spaceprobe.es Data From Space A fantastic new site from Ariel and Lisa: a collection of probes that are out in space right now, with oodles of facts for each mission and links through to more resources. SCIENCE!
NASA GeneLab A beautiful website for ISS-based biology experiments.