NPR Staff

This year's presidential campaign seems to be one of a kind, but it is really part of a bigger picture that stretches beyond the U.S.

Donald Trump's message to anyone who doubts he can win: Look at what happened in the United Kingdom last summer. The vote to leave the EU in June was fueled by some of the same issues that Trump is tapping.

"Believe me. This is Brexit times five. You watch what's going to happen," he said last month.

The Internet can be a dangerous place. Hackers, bots and viruses are prowling the Web trying to turn your machines into zombies.

A couple years ago, artist and illustrator Christoph Niemann felt like he needed to shake things up. "When you do any kind of creative job for a while, you become better ..." he says, "but I think you always become a little bit more predictable."

The Berlin Wall was a scar — a concrete and barbed wire boundary that divided families, East and West, communism and capitalism, tyranny and democracy. People died trying to climb over it while others labored to carve tunnels beneath it.

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:

Pages