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By age 3, kids in low-income households have heard 30 million fewer words than their more affluent peers, research shows. In Providence, R.I., a home visit program is focused on boosting vocabulary.

Paris is suffering from the worst smog it's seen in decades. Associated Press Paris Bureau Chief Angela Charlton explains the ways the city's dealing with the smog, including restrictions on drivers.

The Ukrainian parliament has voted to mobilize 40,000 reservists as Kiev tries to beef up its military following the referendum in Crimea.

European leaders have condemned the secession referendum in Crimea. They have reacted by imposing a visa ban and asset freeze on 21 people said to be behind Russia's actions in the region.

The price and difficulty of building robots has fallen, and Google has scooped a half-dozen robotics firms. It's a safe bet that bots will be an increasing part of our workplaces and daily lives.

Western lawmakers and Interior Secretary Sally Jewell urge changes to the way America pays to fight wildfires, starting with preserving money that's meant for fire prevention.

President Obama will award Medals of Honor to two-dozen soldiers on Tuesday. One of them is Santiago Erevia, who risked his life in 1969 when he charged four North Vietnamese bunkers.

A federal court has thrown out a policy in San Diego that placed tight restrictions on who can carry concealed weapons in public. As other courts consider such rules, the Supreme Court could weigh in.

Physicists say they've discovered a faint signal from just moments after the universe began. If confirmed, it could revolutionize our understanding of the cosmos. But not everyone is convinced.

In the 1980s, NASA engineer Robert Farquhar came up with a sly plan to divert the ISEE-3 satellite from its original path to visit a comet instead. Now Farquhar has another big plan for his "baby."