October 19, 2016 at 02:49AM

Today I Learned: 1) At Caltech, if you don't register for classes, you will be classified as not-enrolled, which can cause you to lose building access priviliges. As far as I can tell, that is the only consequence of not registering. 2) In HTML, the "a" tag is is the tag defining a hyperlink. Why "a"? Seriously, why "a"? I have no idea. 3) The word for a tile used in a mosaic is "tessera", or "tesserae" for plural.