What Amazon's acquisition of the company behind the Roomba means for Boston's tech scene

On Friday, Amazon struck a $1.7 billion deal to buy iRobot, the Bedford-based company known for the Roomba vacuum. In the latest installment of "Tech Talk," technology writer for The Boston Globe, Hiawatha Bray, shares what the acquisition means for antitrust law, privacy, and the fate of Boston tech companies being bought up by bigger firms.