A winter storm packing high winds and potentially several feet of snow blew into the Sierra Nevada on Saturday, triggering thousands of power outages in California, closing a mountain highway at Lake Tahoe, and prompting an avalanche warning in the backcountry. The storm is expected to bring as much as

The World Health Organization says the arrival of one of three trial Ebola vaccines in Uganda Thursday “marks a historical milestone in the global capacity to respond to outbreaks.” The 1,200 doses of the Sudan ebolavirus vaccine arrived “just 79 days after the outbreak was declared on 20 September,” the