A: smartphone

SMARTPHONES DRAIN YOUR CONFIDENCE: Fiddling with your smart phone before your next big date could make you feel insecure. According to a study from Harvard Business School, typing on tiny devices can make you feel less confident. Participants in the study who typed on a smart phone or tablet prior to a meeting were less likely to speak up than their counterparts who typed on a computer. Researchers note that people tend to hunch over their devices while typing on them but their posture opens up when using a full-sized keyboard. Along with increasing your confidence, research shows an open posture raises your pain threshold, ups your testosterone levels, and decreases stress-linked hormones like cortisol. The study’s authors suggest that users stay off their smart phones before important meetings or adopt an expansive body pose while using it. (Men’s Health)