This year, researchers finally uncovered the mysterious roots of so-called brown fat. Hardly blubber, the energy-using tissue turns out to be one step away from muscle.

• 今年，研究人员终于发现了这个所谓的棕色脂肪的神秘根源。令人郁闷的是，这个消耗能量的组织却是与肌肉相差无几。