Power of sugar may come from the mind Only people who believe exertion zaps willpower get a boost from glucose People who need sugary snacks to stay sharp throughout the day could be prisoners of their own beliefs. The brain works just fine without regular shots of sugar in people who believe their willpower is unlimited, a new study shows. “There’s a dominant theory in psychology that willpower i

Elevated carbon dioxide may impair reasoning Insufficient ventilation allows exhaled gas to build up indoors, diminishing decision-making abilities Carbon dioxide has been vilified for decades as a driver of global warming. A new study finds signs that CO2, exhaled in every breath, can exert an equally worrisome threat — impaired cognition — in nearly every energy-efficient classroom, meeting hall