Two of the world’s newest robots are a lot stronger than they appear.

Researchers at Stanford University created tiny robots that can carry or pull objects hundreds and thousands of times their own weight. Called “MicroTugs,” the robots use controllable adhesive technology developed in the Biomimetrics and Dexterous Manipulation Laboratory.

“A 12-gram micro robot uses controllable adhesive (like ants use) to pull 2,000 times its weight,” a description on the MicroTugs webpage reads. “This is the equivalent of a human adult dragging a blue whale around on land.”

Another bot, which weighs nine grams, is capable of carrying more than a kilogram while climbing vertically on glass. Researchers said “this is equivalent to a human climbing up a skyscraper while carrying an elephant

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