Hundreds of thousands of people crowd Copacabana Beach in Rio de Janeiro on Sunday as Pope Francis celebrates the final Mass of his visit to Brazil. Security lapses, traffic chaos and other logistical snafus marred the visit. AFP/Getty Images hide caption

Roughnecks build a drilling rig at the MEG Energy site near Fort McMurray, Alberta, Canada. In addition to large, open-pit mining operations, tar sands oil can be extracted from the ground by pumping down high-pressure steam. Michael S. Williamson/The Washington Post/Getty Images hide caption

The Beer Can House in Houston in 2011. It's estimated that more than 50,000 beer cans were used to cover the entire house. Bill Rand/Flickr hide caption

Mild-mannered teacher by day, masked superhero by night, the Burka Avenger fights corruption and oppression, and aims to empower the girls of Pakistan. Unicorn Black Studios hide caption

The Mexican Consulate processes IDs at an area school. The New York Immigration Coalition goes to events like this one to find immigrants who are eligible for DACA. Melanie Reyes/The New York Immigration Coalition hide caption

Senicka Arciaga-Spears (left), with his siblings and mothers, Kelly and Eliza. Senicka hopes to join the Boy Scouts if the Utah Pride Center's troop charter application is accepted. Terry Gildea/KUER hide caption

There has been a recent push for humanist chaplains in the United States military. Around 13,000 active service members are atheist or agnostic. Here, U.S. Army soldiers bow their heads in prayer during Easter sunrise service at Camp Liberty in Iraq, in 2009. Marko Drobnjakovic/AP hide caption

She-Ca-Go's Leona Cochran attempts to block Jo Cahill's shot during the team's game against the Colorado Combos at the National Senior Games in Cleveland on Monday. Benjamin Morris for NPR hide caption