A pair of tweezers holds a graphene transistor fabricated on a silicon wafer. An I-Corps team from the University of Pennsylvania is working on scaling up their cheaper method of making high-quality graphene, an extremely strong, conductive material one atom thick that was the subject of a Nobel Prize last year.

Courtesy of Zhentang Luo hide caption

toggle caption Courtesy of Zhentang Luo

Dwayne Stenstrom and his wife, Rose, live on South Dakota's Rosebud reservation, where they raised six children. Also pictured is their granddaughter. John Poole/NPR hide caption

toggle caption John Poole/NPR

Paranormal investigator Noah Voss points a video camera at an electromagnetic frequency device to record any abnormal activity at the Sun Prairie Cemetery in Sun Prairie, Wis.

Andy Manis/AP hide caption

toggle caption Andy Manis/AP

Theodore Hardeen (right) poses with brother Harry Houdini around 1901. Although Hardeen was the less-famous brother, he was also a magician and escape artist who continued to perform Houdini's routines after his death.

Courtesy of John Cox/wildabouthoudini.com hide caption

toggle caption Courtesy of John Cox/wildabouthoudini.com

A truck driver cleans his windshield at a filling station in Milford, Conn. The long hours, weeks away from home and mediocre pay contribute to the trucking industry's shortage of an estimated 125,000 drivers.

Spencer Platt/Getty Images hide caption

toggle caption Spencer Platt/Getty Images

Tents pitched at the Occupy Wall Street encampment at Zuccotti Park in New York. The protests are part of a growing distrust in America of government and public institutions.

Mary Altaffer/AP hide caption

toggle caption Mary Altaffer/AP

NPR thanks our sponsors

Become an NPR sponsor