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For the first time ever, a potentially life-threatening tropical storm watch is in effect for Southern California. Hurricane Hilary is expected to make it to the U.S. by Sunday evening.

NASA has just launched a mission to Jupiter's icy moon Europa. A NASA scientist answers kid's questions about the mission and its goals.

New versions of omicron are circulating in the United States and South Africa. Two new studies shed light on the potential for future surges — and the risk factor if you've already had omicron.

The anti-apartheid activist, who died Tuesday, worked to end apartheid alongside Nelson Mandela. In his later years, he lamented South Africa's divisions and criticized President Jacob Zuma.

Sikhulile Moyo led the team that first identified omicron — and was dismayed by the world's reaction — blaming and blacklisting African nations. He's now a bit more optimistic.

Creators of a solar-powered aircraft hope to fly it day and night across the U.S. with no fuel, and eventually around the world. It's a quixotic — some might call it nutty — undertaking. But the creators hope the flight helps challenge assumptions about what solar technology can do.

The U.S. continues its "pivot to Asia," as security concerns in the region grow. This week, Indian Prime Minister Narendra Modi will address a joint meeting of Congress, a rare honor.

Some of the world's most vulnerable countries at the U.N. climate conference in Scotland are demanding compensation, and it's becoming a major sticking point in the negotiations.

The latest estimate from various forecast centers around the world say the planet is approaching a warming threshold international agreements are trying to prevent.

Abraham Lincoln always thought slavery was unjust — but struggled with what to do once slavery ended. Historian Eric Foner traces how Lincoln's thoughts about slavery — and freed slaves — mirrored America's own transformation in The Fiery Trial: Abraham Lincoln and American Slavery.