Horsetail Fall blazes in winter sunset
                                
                                
                                    (Newser) -
                                    A confluence of just-the-right weather conditions at the perfect time of day—and year —can turn a Yosemite waterfall into a cascade of fire—at least, that's what it looks like. Sometime in mid-February the setting sun lights up one of the waterfalls of the national park in...