Friday morning coffee reads

Here is a regular roundup of interesting stories from the week.

1. A landslide of classic art is about to enter the public domain.
2. There is an arms race in artificial intelligence.
3. The most serious environmental problem is indoor air pollution from burning dirty fuels like wood and dung.
4. The rise of Russia’s neo-Nazi football hooligans.
5. Southwest 1380: Think about the flight attendants.
6. A farewell to free journalism.