Silent. Rigid. Clumsy. Henry and Jane Evans are used to awkward houseguests. For more than a decade, the couple, who live in Los Altos Hills, California, have hosted a slew of robots in their home.  In 2002, at age 40, Henry had a massive stroke, which left him with quadriplegia and an inability to speak. Since then, he’s learned how to communicate by moving his eyes over a letter board, but he is highly reliant on caregivers and his wife, Jane.  Henry got a glimmer of a different kind of li...