Gov. Scott Walker, R-Wis., holds up a $1 bill during a town hall in Las Vegas where he announced his plan to take on labor unions. Isaac Brekken/AP hide caption

A voter fills out her ballot in Las Vegas in 2004. A new report finds several states, including Nevada, have voting machines more than 10 years old, which are more likely to fail. David McNew/Getty Images hide caption

Aspirin can lower the risk of heart attacks, but there's concern that it's being overused. Jim DeLillo/iStockphoto hide caption

Mark Patterson, owner of PATCO Construction in Sanford, Maine, said his company lost more than $500,000 to cyberfraud. John Ydstie/NPR hide caption

"Poetry is a call to action," says poet laureate Juan Felipe Herrera, "and it also is action." Ariel Zambelich/NPR hide caption