Delivery alert

There may be an issue with the delivery of your newspaper. This alert will expire at NaN. Click here for more info.

Recover password

Piaggio Fast Forward CEO Greg Lynn, center, is followed by his company’s Gita carrier robot as he crosses a street on Monday, Nov. 11, in Boston. The two-wheeled machine is carrying a backpack and uses cameras and sensors to track its owner. (AP Photo / Matt O’Brien)