At the 2012 USA Science & Engineering Festival, children swarmed a National Science Foundation exhibit booth featuring electric-powered, child-sized toy cars. Assistants carefully explained how to operate the cars, which featured unique designs and operating features. One of cars, for example, would move only if the child driver remained standing. To stop, the driver had to sit down.

Excited children and their parents wondered about the cars’ purpose; after all, these cars weren’t being exhibited at a science and engineering event for being ordinary toys.

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