Scientists use a mesh material as a scaffold to seed bladder cells as they grow. After three to six weeks, the cells are transplanted inside the child's urethra, where they eventually replace the damaged tissue. Wake Forest Institute for Regenerative Medicine hide caption

This young patient from India received his cornea transplant in 2009, when he was 10. Here he is shown before (above) and after (below) the transplant, which he received at the LV Prasad Eye Institute (LVPEI), SightLife's partner center in Hyderabad, India. Courtesy of LVPEI hide caption

A man gets a checkup from Dr. Olveen Carrasquillo at the University of Miami's Miller School of Medicine in January. Joe Raedle/Getty Images hide caption

Raj Rajaratnam, the billionaire founder of the Galleon Group, a major hedge fund, leaves Manhattan federal court in New York in February. Louis Lanzano/AP hide caption

Usher (left) and Beyonce (right) performed at private concerts funded by the family of Libyan President Moammar Gadhafi. Gadhafi's son Hannibal is at center. Bryan Bedder (l), Juan Barreto (c), Koichi Kamoshida (r)/Getty Images hide caption

Steven Tyler, Jennifer Lopez and Randy Jackson are hard at work on the new season of American Idol. Frank Micelotta/Fox hide caption

An employee counts bundles of Thai bahts at Krung Thai Bank in Bangkok in October. A tidal wave of money is pouring into Asia and driving up regional currencies. Pornchai Kittiwongsakul/AFP/Getty Images hide caption

A woman dressed in rags is the subject of Tattered and Torn by Alfred Kappes. Oil on canvas, 1886. Smith College Museum of Art, Northampton, Mass hide caption