Editors’ note, July 30: On July 27, the Federal Communications Commission issued an update clarifying how its national security restrictions on equipment from foreign companies would apply to robots.

A pool can be a wonderful addition to your backyard, useful for both outdoor entertainment and exercise. And in certain housing markets, it can even add value to your home. However, a pool ...

Predicts how many families will arrive at a community pool in each open hour of a given day, from the day's weather — and lets you explore what the model learned, or just ask it in plain language. See ...