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The United States and 19 other countries on Monday promised to work toward doubling their spending over five years to support "clean energy" research.

At the same time, 28 private investors, including Microsoft's Bill Gates, Facebook's Mark Zuckerberg and Amazon's Jeff Bezos, pledged their own money to help build private businesses based on that public research.

Minnesota prosecutors have charged four men in connection with last week's shooting that injured five people at a protest over the killing of a black man by Minneapolis police.

Hennepin County Attorney Mike Freeman said during a news conference that the accused shooter, Allen Lawrence Scarsella, 23, was charged with five counts of second-degree assault with a dangerous weapon and one count of second-degree riot.

Amazon has released a glimpse of what its much-anticipated drone deliveries could look like, although it warns the service is still very much in a testing phase.

As the U.S. chowed down on turkey, stuffing and leftovers, Pope Francis visited Uganda, Kenya and the Central African Republic for a six-day trip, continuing his focus on the developing world.

There's a building in Mountain View, Calif., where energy-saving technologies of the future are being tried on for size.

Step inside, and the first thing you notice is the building is dead quiet: no noisy air whooshing through louvers.

That's because the building uses passive cooling instead of traditional air conditioning. Cool ground water passes through a system of small tubes running below the ceiling.