NPR Staff

Shocked by someone wearing a costume inspired by the Zika virus? Don't be. People have been dressing up as infectious diseases for hundreds of years, way before trick-or-treating became an American Halloween tradition in the 1920s.

Take this quiz to see how much you know about global disease costumes of the past and present:

Updated at 7:58 p.m. ET

Newly discovered emails being examined by the FBI in relation to Hillary Clinton's email server came to light in the course of an unrelated criminal investigation of Anthony Weiner, a source familiar with the matter tells NPR's Carrie Johnson.

Weiner is the estranged husband of close Clinton aide Huma Abedin; he has been under scrutiny for sending illicit text messages to an underage girl. Sources said authorities seized electronic devices in their home, which led them to this new information.

Protests against the Dakota Access Pipeline have been raging for months, but tensions have been escalating. Recently, tribal leaders — led by Standing Rock Sioux Tribe Chairman Dave Archambault II — called on the Department of Justice to look into what they describe as unnecessary use of force by state and local law enforcement.

After a bruising career in the rough and tumble NHL, who could blame a guy for wanting to take it easy? At age 55, Wayne Gretzky is still playing charity games with other old timers, but "I'm getting older and slower," he says with a laugh.

Along the border between the U.S. and Mexico, armed groups on patrol — mostly men — look for illegal immigrants and drug traffickers. They're not U.S. Border Patrol, but regular people who've decided to take matters into their own hands.

They call themselves militias. Groups such as these have been around for decades, but they exploded in number after Barack Obama was elected president. Today, there are 276 militia groups around the country, according to the Southern Poverty Law Center.

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