Juan Carlos Castillo, a state official in rural Mexico, had never received a call like this before. What looked like a giant plastic jellyfish with a blinking LED had fallen from the sky onto a farmer’s field. “It really caused panic,” he says. “I imagined that it could be espionage.” Then Castillo noticed a phone number attached to the floppy artifact. He called it and got through to Google’s parent Alphabet, in California.

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