The algorithms that serve up what you like can often create closed loops of their own, packed only with people who agree with you already. Hiroshi Watanabe/Getty Images hide caption

German Chancellor Angela Merkel (right), and British Prime Minister Theresa May (left), listen to translations during a joint news conference in Berlin on July 20. They are the two most important figures in the negotiations over Britain's departure from the European Union, the so-called Brexit. Michael Sohn/AP hide caption

The Janks Archive's creators gathered insults from cities all over the world, including Helsinki, Mexico City, Berlin and New York (pictured). Courtesy of the Janks Archive hide caption

French flags are seen lowered at half-staff in Nice on July 16. The truck attack on July 14 killed 84 people. "I felt coming to celebrate on holiday and people are in mourning didn't seem right," one vacationer says. "But I'm glad I came." Valery Hache/AFP/Getty Images hide caption

"It's easier for me to sell direct to a customer now," says James Ernest, co-creator of the game Unexploded Cow. The board game is one of the most popular created by Ernest, who's made ample use of crowdfunding sites. Courtesy of Cheapass Games hide caption

A first-timer's attempt at making part of a 'character bento,' or Kyaraben, lunch. Elise Hu/NPR hide caption

A cyclist looks at the flowers and messages placed along the beach for victims of the recent terrorist attack in Nice, France, on Wednesday. The recent spate of attacks around the world has raised questions about the limits of counterterrorism. Claude Paris/AP hide caption

Philly.fyi Executive Director Billy Taylor holds permits to most of the park across from the convention. Jeff Brady/NPR hide caption

Activists and supporters march on International Women's Day on March 8 in Rio de Janeiro, Brazil. Marchers called for protection from male violence in a country with high rates of murder and assaults of women. Mario Tama/Getty Images hide caption

The blue-green algae is called cyanobacteria. It can release toxins that affect the liver and nervous system. Greg Allen/NPR hide caption

Wonder Woman display at Comic-Con International 2016 preview night on July 20, 2016 in San Diego, California. Matt Cowan/Getty Images hide caption

A Russian skating fan holds the country's national flag over the Olympic rings before the start of the men's 10,000-meter speedskating race at Adler Arena Skating Center during the 2014 Winter Olympics in Sochi, Russia. David J. Phillip/AP hide caption