Search teams recovered a 13th body rom the snow and ice covering a dangerous climbing pass on Mount Everest, where an avalanche a day earlier swept over a group of Sherpa guides in the deadliest disaster on the world’s highest peak. Another three guides remained missing, and searchers were working quickly to find them in case weather conditions deteriorated, said Maddhu Sunan Burlakoti, head of the Nepalese government’s mountaineering department. But the painstaking effort involved testing the strength of newly fallen snow and using extra…