Dinosaurs ruled Earth for 180 million years, but to dominate they had to outcompete a slew of other animals. Paleontologist Emma Schachner thinks their lungs could have been the competitive advantage

Journalist Beth Gardiner and activist Yvette Arellano explain the long-term health effects of air pollution. Yvette lives in a Houston neighborhood near the largest petrochemical complex in the U.S.

They say new police and surveillance powers could, if history is a guide, be used against Blacks and other people of color in the justice system, not the white rioters who stormed the Capitol.

Restaurants and bars are reeling from spikes of coronavirus cases in their communities. Earlier holiday sales meant online shopping and electronics sales dipped in December. Retail sales fell 0.7%.