2020-11-13 sns https://www.wolfram.com/mathematica/new-in-9/social-network-analysis/communities-in-facebook-friend-networks.html https://blog.wolfram.com/2020/10/29/new-wolfram-language-books-on-wolframalpha-calculus-applied-engineering-and-system-modeler/?fbclid=IwAR3A0oSnR-zevJFLjDkN7SwUgBurJDaAddmQhOrt14DTY6Sn1IzLlX1yIMA