The U.N. humanitarian chief is hoping a major ministerial meeting Tuesday will not only raise $1 billion for the three countries at the epicenter of a humanitarian crisis in Africa’s Sahel region but also spur leaders to address the underlying causes, including increasing conflict and insecurity, weak governance and a lack of development. Undersecretary-General Mark Lowcock said in an interview...

People have been diving to the Titanic's wreck for 35 years. No one has found human remains, according to the company that owns the salvage rights.

After almost two years circling an ancient asteroid hundreds of millions of miles away, a NASA spacecraft this week will attempt to descend to the treacherous, boulder-packed surface and snatch a handful of rubble.

The Western Antarctic Peninsula is one of the fastest warming places on earth. It is also home to threatened humpback and minke whales, chinstrap, Adélie and gentoo penguin colonies, leopard seals, killer whales, seabirds like skuas and giant petrels, and krill—the bedrock of the Antarctic food chain.