Political violence, made easier to carry out by the proliferation of guns, harms democracy by shifting the field of political disagreement from debate to aggression.
Friendship isn’t a tit-for-tat balance sheet, but that’s how researchers have traditionally defined it. New studies are refining the model to be less about transactions and truer to real life.
Researchers are gaining insights into how external factors like air pollutants, diet and medications, and even microbes in the gut interact with regulatory T cells, for better or for worse.
A consensus is emerging among scientists that certain foods are addictive for some people. But questions remain about which foods, which people and why.