Maggie's Farm February 20. 2018 Tuesday morning links

The Forgotten History of New York’s Bagel Famines - Remembering Local 338 and the world’s toughest bagel bakers.
100 Chicago Professors "Propose To Exclude Viewpoints They Find Objectionable"
Government Spending on Higher Education Reaches an All-Time High…
Once again, climate scientists use a single tree to define global change…
San Francisco's Diseased Streets…