I was never all that sure about joining Twitter, but it’s paid off. My most recent post was about a very interesting article I saw mentioned on Twitter. A request to the relevant twit pointed me in the direction of heaps more by the same author. Thanks, @dcox21! I shan’t want for something to read for quite a while.
(Hung-Hsi Wu is a member of the Mathematics Department at the University of California, Berkeley. The linked articles are about high school mathematics education.)