Bartender Matt Carucci says he rarely feels safe biking in the city but often rides without a helmet anyway. "There are a lot of other ways to hurt yourself," he says.

Chicagoans Matthew Kutz and Molly Widges didn't bring helmets to D.C. but felt safe anyway on the slow, heavy Bikeshare bikes. "You're never going to get into a high-speed collision," Kutz says.

Tom Suppan, a "bicyclist by nature," rarely rides without a helmet. "I've fallen too often not to wear one," he says. "If I hadn't had the helmet on, I'd have been in bad shape."

Kay McLoughlin, an editorial coordinator, sports a Capital Bikeshare-branded helmet. "This is my D.C. helmet, I keep it on top of my desk," she says. She has a second helmet for riding at home.

Actor Colin Hanks and NPR White House Correspondent Ari Shapiro at NPR's Friday Night Spin Party held at Gibson Guitar in Washington, DC

Guy Raz and his father talk with Ted Koppel at NPR's Friday Night Spin Party held at Gibson Guitar, in Washington.

Arianna Huffington and NPR president and CEO Gary Knell at NPR's Friday Night Spin Party.

NPR's Nina Totenberg speaks with Ari Shapiro at the end of the first day of oral arguments.

Demonstrators both for and against the new health care law turned out on the steps of the Supreme Court on Tuesday

Pastor Warren H. Stewart of First Institutional Baptist Church in Phoenix joins other clergy members to demonstrate against SB 1070.

Michael McLaughlin, vice president of the American Council for Immigration Reform, demonstrates in support of SB 1070.

Robert Yochem, 45, of Baltimore, supports healthcare reform.

Carolyn Weller opposes Obamacare and came from Idaho to join the scene outside the Supreme Court.

Joanne Bagnerise of Dumfries, Va., supports healthcare reform.

Holly Harness (left), a supporter of the health care law, argues with Susan Clark, an opponent of the law, outside the Supreme Court on Wednesday.

Republican presidential candidate Rick Santorum speaks outside the Supreme Court on Monday, March 26.

Kim Liss and her 10-month-old son Henry, Watch Discovery do its final voyage over the National Mall, on April 17, 2012.

Scores of people took time out of their day to watch Discovery fly over the National Mall, on April 17, 2012.

Kishi Bashi performs at the 9:30 Club on Tuesday, April 3, 2012.

Kishi Bashi performs at the 9:30 Club on Tuesday, April 3, 2012.

Of Montreal performs at the 9:30 Club on Tuesday, April 3, 2012.

Of Montreal performs at the 9:30 Club on Tuesday, April 3, 2012.