Near the end of sixth grade, Bronia DePedrina’s daughter became anxious and stressed about going to school.

The teacher's quiz questions reflect fat shaming, promote values based on looks and imply that girls aren't good at math, parents said.

Baez called for the development of new mathematics — he called it “green” math — to better capture the workings of Earth’s biosphere and climate. For his part, he sought to apply category theory, a ...