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Analyzing the tweets of millions of users suggested cross-cultural, Earth-wide trends in peoples' moods across days and weeks: We're more positive in the morning and late evening. The results point to new ways that academic research might tap into social media.

Legal briefs were filed today in a suit that accuses SANDAG of promoting dependence on car travel.

Airs Saturday, January 12, 2013 at 2 p.m. on KPBS TV

The British band's goal was simple: sound like four guys playing music in a room.

Northern Arizona University biologists have pinpointed the source of one of the deadliest plagues of all time. The discovery not only solves some ancient mysteries about the first pandemic, but could also provide answers in the event of a bioterrorism threat.

Instead of waiting for individual hospitals to apply to build proton centers, a health planning council solicited proposals, promising to favor collaborative approaches. A five-hospital group that teamed with a private company got the go-ahead to build in New York City.

During the recent debate in Washington, D.C., over whether to let to local competing hospital systems build rival proton beam therapy centers, an obvious question was raised: Why not team up?

New PBS and PBS Kids Channels on Roku Offer Hundreds of Videos On-Demand, including NOVA, MASTERPIECE, FRONTLINE, SUPER WHY!, CURIOUS GEORGE and local favorites such as KPBS EVENING EDITION and KEN KRAMER’S ABOUT SAN DIEGO.

On April 9,1959, the U.S. introduced its first astronauts, and then launched their wives into the spotlight. In The Astronaut Wives Club, Lily Koppel looks at how seven women coped with the attention and anxiety that came with being married to the space race.

The San Diego Zoo outfitted 36 desert tortoises with radio transmitters, 24 of them with GPS systems, to track their movements and habitat choices in Nevada, the park announced today.