Blushing – the reddening and warming of cheeks when one becomes self-conscious – could come from increased activity in brain parts involved in emotional arousal when one feels “exposed,” a study has found. Researchers said that little is known about what is going on underneath while we are blushing – famously described by biologist Charles Darwin as “the most human of all expressions.” The team, including researchers from the University of Amsterdam, the Netherlands, turned to girl teenagers performing karaoke to find out if blushing was a rapid, spontaneous emotional…