More than 100 years ago, Golgi staining on nerve cells opened the gates to modern neuroscience. Scientists recently developed the Technicolor version of Golgi staining, Brainbow, allowing more detailed reconstructions of brain circuits. AFP/Getty Images hide caption
Alcatraz, the infamous prison, still captures the imagination 50 years after it closed. Those who did time there, however, don't have to wonder. Leigh Wiener/Courtesy Devik Wiener hide caption
People pass the World Trade Center construction site in New York. Debris from the fallen towers will be sifted for victims' remains beginning Monday. Mark Lennihan/AP hide caption
Television satirist Bassem Youssef waves to supporters as he enters Egypt's state prosecutors office to face accusations of insulting Islam and the country's Islamist leader in Cairo on Sunday. Amr Nabil/AP hide caption
This undated photo taken from the Kaufman County, Texas, website shows Kaufman County District Attorney Mike McLelland. McLelland and his wife were found killed in their house on Saturday. AP hide caption
From left, Sen. Jeff Flake, R-Ariz., Sen. Chuck Schumer, D-NY, Sen. John McCain, R-Ariz., and Sen. Michael Bennett, D-Colo, arrive at a news conference after their tour of the Mexico border with the United States on Wednesday in Nogales, Ariz. The senators are part of the "Gang of Eight," a larger group of legislators collaborating on changes to immigration. Ross D. Franklin/AP hide caption
Pope Francis celebrates the Easter mass on Sunday at the Vatican. AFP/Getty Images hide caption
Baylor's Brittney Griner goes up to dunk in a second-round game of the NCAA women's college basketball tournament against Florida State on Tuesday in Waco, Texas. On Sunday, Baylor faces Louisville. Tony Gutierrez/AP hide caption
Syracuse forward C.J. Fair (No. 5) shoots over Marquette forward Jamil Wilson (No. 0) during the second half of the East Regional final in the NCAA men's college basketball tournament on Saturday. Pablo Martinez Monsivais/AP hide caption
Officers stand by in 1955 as religious leaders from Chicago demonstrate outside the White House in Washington over the murder of 14-year-old Emmett Till. AP hide caption
Joy Reynolds of San Diego looks at the newspapers on display at the Newseum in Washington, D.C., on June 29, 2012, following the Supreme Court ruling on President Obama's health care law. David Goldman/AP hide caption
Phil Ramone in New York in 1997. Ken Weingart/Getty Images hide caption
Sen. Carl Levin has been a vocal advocate for transparency in political ad spending. Alex Wong/Getty Images hide caption