A robot designed to carry things moves quickly across a field to gather equipment at a sports event. The equipment, like javelins and discuses, had been thrown by competitors. Another robot moves a human sized screen on wheels. It is designed to permit virtual attendance at the event. And, then there are the robots designed to look like the smiling, friendly creatures or mascots that act as Olympic Games representatives. All these robots are part of preparations for the 2020 Olympic Games, in Tokyo, Japan. Japanese car maker Toyota Motor Corporation presented the machines to reporters earlier this week. Toyota is a major supporter of the 2020 Olympic Games. The mascot robots have moving arms and legs, and their eyes change to the image of stars and hearts. They cannot speak at all or walk very well.