Travelers flying out of Boston’s Logan International Airport may have met its newest assistant, Carla. She’s upbeat, informative – but not human.This hologramlike virtual assistant stands by one of Logan’s checkpoints, explaining the rules for passing through security. As she bops through each regulation, pictures of cellphones and toiletries (neatly packed into plastic bags) appear above her hands (like at 0.43 in video below) After the two-minute spiel, Carla repeats the message in Spanish.


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