Residents of Boston in the US state of Massachusetts interact with robots at the MassRobotics 4th Annual Robot Block Party, one of the world's major robotics festivals that attracts an estimated 5,000 visitors. "It seems that every year we have more things rolling, more things flying, more dogs, more quadrupedal robots, more cars," says Joyce Sidopoulos, Vice President of Programs and Community at MassRobotics. IMAGES AND SOUNDBITES