Many of us have had the frustrating experience of being in the middle of a conversation with someone, only to have that person answer a phone call or respond to a text. It can be discouraging to feel like you’re competing with a cell phone for someone’s attention…and losing. New research shows, however, that a mobile device doesn’t even have to be ringing or buzzing to ruin your conversation. Suppose you sit down with a friend for some coffee and a visit, and he places his cell phone on the