Legislatures in nearly a dozen states have voted to legalize use of the technology, which can help homeowners reduce their rising electricity costs.

© Poppy Lynch for The New York Times

Ten U.S. states have legalized systems that can be plugged into standard wall outlets. The technology typically does not require permits or electricians.

© Poppy Lynch for The New York Times

Ten U.S. states have legalized systems that can be plugged into standard wall outlets. The technology typically does not require permits or electricians.

As tech giants rush to build infrastructure, some residents who live near data centers say a constant low-frequency vibration is ruining their health and homes.

Over five frantic days, I gambled my family’s life savings on a hunch that A.I. could outperform a real estate agent.