Merrit Kennedy

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 starts cracking up themselves.

Updated at 5:10 p.m. ET

In a midday attack near the U.K. Parliament building, an assailant killed two civilians and a police officer before being shot to death, British authorities say.

At least 20 people were injured in the attack, which police describe as a terrorist incident. Authorities say they believe there was a single attacker, driving a vehicle and armed with at least one knife.

Prime Minister Theresa May condemned the attack as "sick and depraved" in remarks on Wednesday evening.

Before Dyann Roof shot dead nine parishioners at a historically black church in Charleston, S.C., in 2015, he told his friend Joey Meek about his murderous plans during an alcohol and cocaine-fueled night.

Meek, 22, was sentenced Tuesday to 27 months in federal prison for concealing knowledge of a felony and then making false statements to the FBI.

A green sea turtle in Thailand that drew international sympathy when it emerged that she had consumed nearly 1,000 coins thrown into her pool has died.

The turtle nicknamed Omsin, the Thai word for "piggy bank," had an hours-long emergency surgery to remove the coins earlier this month. But she never woke up from a second emergency surgery.

A tree crashed onto a group of people enjoying a swim at the base of a large waterfall in Ghana, and local authorities tell wire services that at least 17 people were killed in the freak accident.

The revelers got caught in a rainstorm on Sunday, according to a statement from the Minister of Tourism. She added that "many" were killed and injured, and that they were mostly student groups visiting the area.

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