California's Killer Bees Are Spreading North

Scientists from the University of California, San Diego recently collected hundreds of bees around the Golden State to determine how far north hybrid honeybees, or Africanized bees, have spread since they first arrived in the state in 1994. They found that Africanized bees — which possess genes from both European and African honeybees — now live as far north as California's delta region (about 25 miles, or 40 kilometers, south of Sacramento). About 65 percent of the honeybeesthat buz