Merrit Kennedy

As China prepares to impose a domestic ban on the ivory trade, a new report has found that the price of raw ivory there is plummeting.

It's good news for Africa's elephants, which have been poached by the thousands for their tusks. Many of those tusks are then smuggled to China, which has been one of the world's largest markets for the banned material.

In Washington, D.C., U.S. Capitol Police say they have arrested an adult suspect after an incident Wednesday in which a driver "nearly struck" police officers and shots were fired.

The officers observed an "erratic and aggressive" driver near the U.S. Capitol on Independence Avenue at 9:22 a.m. ET and tried to carry out a traffic stop, Capitol Police communications Director Eva Malecki said in a statement to NPR.

In a victory for Flint residents, the state of Michigan has agreed to spend up to $97 million for new water lines in the city of Flint, which has been struggling with a crisis over lead in its water for the past three years.

A federal judge at the U.S. District Court for Michigan's eastern district approved the agreement Tuesday. Within three years, authorities must examine water service lines for at least 18,000 households and replace those made of lead and galvanized steel.

For the first time in birds, researchers say they have found evidence that a New Zealand parrot has the avian equivalent of an infectious laugh.

They call it "positive emotional contagion" — which they define as "outwardly emotional actions that spread from one individual to another." In humans, this is what happens when one person hears another laugh and also starts cracking up.

Updated at 4:30 a.m. ET Thursday

British authorities have made eight arrests in their investigation into Wednesday's attack in London, police said Thursday morning.

Mark Rowley, the national lead for counterterrorism policing, told reporters that there were four dead, including the attacker, and 29 people have been treated in hospitals. Seven people are in critical condition, he said.

Police had earlier said there were five dead including the attacker.

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