I stand in front of a lanky two-legged robot stomping along a treadmill. I watch, all impressed, until the researcher next to me tells me to trip it. The thing looks expensive, so I hesitate. Really, he tells me, it’s OK. And he probably knows better than I do, so I drag my boot along its shin like a good soccer trip. The robot stammers, yet recovers. And then again, and again. No matter how much I pester it, the thing just keeps stomping. I keep feeling guilty.
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