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Phosphorus is one of the nutrients that plants need to grow, and for most of human history, farmers always needed more of it. But excess phosphorus, either from manure or manufactured fertilizer, can run off into streams and lakes and become an ecological disaster.

A Harvard economist finds there are psychological connections between the bad financial planning of many poor people and the poor time management of busy professionals. In both cases, he finds the experience of scarcity causes biases in the mind that exacerbate problems.

The 52 scientists and paying passengers aboard the MV Akademik Shokalskiy had been stranded by ice since Christmas Eve. They've been flown by helicopter to an Australian ship in open waters. The 22 crew members of the Akademik Shokalskiy are staying behind. It's hoped the ship will soon break free.

Fifty years ago, science-fiction writer Isaac Asimov foresaw gadgets that "relieve mankind of tedious jobs" like machines that heat water and prepare coffee. He predicted smartphones — noting we'd be able to see and hear someone we call, and be able to look at photos on the same screen.

Parts of the Northeast and New England are expected to be hit the hardest today and Friday. More than a foot of snow may fall on Boston. The wind chill may plunge to 40 degrees below zero in the Adirondacks. Flight delays and cancellations are piling up along with the snow.

Her role as Annie Johnson in the 1959 film Imitation of Life led to an Oscar nomination — just the fifth at that time for a black actor or actress. Moore was 99 when she died on Wednesday.

The Palestinian ambassador to the Czech Republic was killed Wednesday by an explosion at his home in Prague. At first, officials said he may have triggered a bomb meant to explode only if a safe was tampered with. But other officials are disputing that account.

The talks in Ethiopia will focus on a cease-fire, as well as political prisoners and the 2015 presidential elections. But the fighting in the world's newest country continued even as delegates gathered.

Workers from the sector, Cambodia's biggest export earner, want the country's minimum wage doubled. Protests by garment workers are not unusual, but Friday's violence represents an escalation, and comes amid growing demonstrations against Prime Minister Hun Sen's government.

Teachers of color leave the profession 24 percent more often than white teachers, according to a study from the University of Pennsylvania. Amanda Machado wrote about why she quit teaching in a recent article for The Atlantic. Host Michel Martin speaks with her about that decision, and the challenges that teachers of color face.