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A year before Columbine, a streak of school shootings had America debating whether they were a blip or a trend. The last fatal mass shooting of the 1998 school year was in Springfield, Ore.

San Diego's fifth open streets event CiclosDias takes place downtown on Sunday, with plans for a preview demonstration of forthcoming protected bike lanes.

The U.S. is producing more oil than ever, even as calls to leave all fossil fuels in the ground grow louder. Now the "keep it in the ground" movement is taking its fight to the heart of oil country.

Molly McCully Brown, who has cerebral palsy, says that if she'd been born in a different era, she might have been sent to the "Virginia State Colony," an early landmark of the U.S. eugenics movement.

Undocumented patients with kidney disease often can't get treatment unless they are in a state of emergency — this bothers clinicians who want to treat all patients equally.

NASA is building a new space-based laser communication that will allow live, high-definition video from Mars and beyond — something that's not possible with standard radio equipment.

During Harvey, Irma and Maria, rising floodwaters and high winds raised alarm. But afterward there are new risks — standing water, mold, mosquitoes, deadly heat. Despair can linger, too.

Many anti-obesity programs focus on children's diet and behavior during the school year. A new study is the latest of many that finds the weight gain comes when kids are out for summer vacation.

As cities and companies — including Starbucks — move to oust straws in a bid to reduce pollution, people with disabilities say they're losing access to a necessary, lifesaving tool.

As cities and companies — including Starbucks — move to oust straws in a bid to reduce pollution, people with disabilities say they're losing access to a necessary, lifesaving tool.