PROVIDENCE — It's called Summit Fever, the compulsion to summit Mount Everest even though every inch of your body tells you to turn around.It has contributed to one of the deadliest climbing seasons on the world's tallest mountain, with 11 deaths this year. It has resulted in traffic jams on the knife-like ridge to the top, with climbers stacked up dozens deep while their oxygen tanks run dangerously low.Tim Warren, a chiropractor from North Kingstown, climbed Everest in [...]