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The goal, XPrize says, is to tackle "the biggest threat facing humanity — fighting climate change and rebalancing Earth's carbon cycle. "

A comedian offers his "Mobituary" for the Iowa caucuses, which, after this week, may have hammered the nails in their own coffins.

The populist ex-mayor of London, a vocal proponent of the Brexit, was considered a top candidate to replace David Cameron as prime minister. Then one of Johnson's allies announced his candidacy.

For centuries, people thought sap had to flow down a tree's body through a spigot at the bottom. But researchers have discovered that sap can flow upward, too, which allows syrup production from much younger trees, and could even turn maple syrup into a row crop.

The social network is fighting foreign efforts to manipulate and mislead its users ahead of the 2020 presidential election. CEO Mark Zuckerberg called election security one of his "top priorities."

House Minority Leader Kevin McCarthy, R-Calif., is looking to temporarily add more of President Trump's allies to the panel in anticipation of public impeachment hearings.

The storm system has prompted tornado and flash flood warnings, and officials are keeping a close watch on New Orleans' levee system and infrastructure, which failed during Hurricane Katrina in 2005.

Limited information from Russian authorities about an explosion at a missile test site last week have led to speculation that it involved a top-secret nuclear-powered cruise missile.

The agreements were hailed as a major step toward decarbonizing the auto industry, but the world's largest auto markets, including the U.S., and top carmakers failed to sign on.

Last month, the Chinese player posted on social media that a former top Communist Party official had assaulted her a decade ago. She then dropped out of sight, prompting concerns for her safety.

Looking back, countdowns weren't always good news. Think atomic bomb tests. Americans also counted down moon missions and Top 40 hits. It wasn't until 1979 that a Times Square crowd joined in.

The White House's top medical adviser says the virus won't go away entirely. Instead, it should eventually hit a level where it "doesn't disrupt our normal social, economic and other interactions."