Ask HN: Do an AMA (December 2016)

To everyone who wants to share their knowledge and help others: Do an Ask Me Anything session on HN.

HN is full of smart people. They often appear in comments, but threads get closed after a while and leave no way to reach the authors out. Let's have them here.

Suggest a topic you want to answer questions about in comments. Ask your questions to other authors. Topics uncommon to HN, like woodworking and singing, are especially welcomed.