A colony of honeybees. An unknown pathogen is pushing the industrious honeybee to disaster as scientists scurry to figure out what the cause is. Early results of a key study by the USDA and Pennsylvania State University point towards some kind of disease or parasite. About one-third of the human diet comes from insect-pollinated plants and the honeybee is responsible for 80 percent of that pollination, according to the USDA. Credit: Haraz N. Ghanbari/AP