I'm sure most of you know more about this than me. But since I'm in a kind of pseudo-holiday state between work and doing nothing, perhaps you are too: Amazing: Karim Adiprasito proved the g-conjecture for spheres! https://gilkalai.wordpress.com/2018/12/25/amazing-karim-adiprasito-proved-the-g-conjecture-for-spheres/ -- ☣ uǝlƃ