Two open letters from scientists and science advocacy groups reflect a growing anxiety about the future of federal science under President-elect Trump

A look at the curious history of Venn diagrams and how they blend logic with geometry

Recurring dreams may feature taking a test the dreamer didn’t study for, having to make a speech or being attacked. Here’s why our sleeping brain comes back to these unpleasant dreams again and again

Fires can make drinking water, pipes and tanks unsafe. An environmental engineer explains why that’s so and what to do

Wildfires burning in cities unleash a toxic, unpredictable combination of compounds into the air