Federal agents have pepper-sprayed, tackled and detained people recording their actions. If you post your recordings of agents, you also risk the feds tracking you and those around you.
Antibiotics transformed health care for the better, but their diminishing effectiveness may soon be its undoing. Researchers are studying ways to fight back against resistance.
Artificial intelligence systems have big environmental costs but are also finding ways to save energy and water, cut emissions and make businesses more efficient.