Gaming is a big part of the billionaire’s public persona. But other players are questioning whether he has the time or the skill to be as accomplished as he claims.

Here’s what to know about potential savings on your power bill, and the environmental benefits.

The panels, removed under Ronald Reagan, found new homes from Maine to China. And their legacy still reverberates.

Forrest Meggers, a professor at Princeton University, has turned his home into a live-in laboratory that pushes the boundaries of sustainability.

© James Estrin/The New York Times