Study shows brain stimulation with external electronic headset produces weight loss rivaling shots, pills; Breast-feeding moms gain less post-pregnancy weight; Scientists find hidden weight gain trigger in soybean oil; Calculators that assess your risk for heart disease miss the boat—half of actual heart attack victims were said to be at low-risk; Common amino acid may bust Alzheimer’s plaque; Adequate sleep may trump healthy diet, exercise for longevity; And more!