The Roborock S8 MaxV Ultra ($1,799.99) is a robot vacuum and mop with a charging dock that fills the robot’s onboard water tank, cleans and dries its mop pads, and empties its onboard dustbin.

Welcome to SUMO Robot Challenge, OCAD's annual event since 1992, where homemade robots compete head to head in different divisions. They range from two to 200 pounds and are made by tweens, teens ...