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Agronomist Cristina Negri collects poplar samples to measure the pollutants sucked from the earth.

Center for Nanoscale Materials Division Director Amanda Petford-Long (right) leads a tour of the CNM for Idaho National Laboratory Director John Grossenbacher (middle) and INL Deputy Director David Hill on February 18, 2010.

Chemist Xiaoping Wang measures the stability of a platinum cathode electrocatalyst.

Pam Sydelko is the Deputy Associate Laboratory Director, Energy Sciences and Engineering.

Chemist Lin Chen is recognized internationally for her ground-breaking contributions in the excited-state structural studies using X-ray transient absorption spectroscopy. She was honored in 2012 as a fellow of the American Association for the Advancement of Science for her "contributions to understanding structural dynamics of molecular excited states with special emphasis on problems related to renewable energy."

Jennifer Salazar is a Coordinating Writer and Editor in Argonne’s Computing, Environment and Life Sciences directorate. "I've found that our researchers want to share what excites them and communicate it to others in the wider research community or to the public, and this offers a great environment for a writer," she said.

Ann Schlenker, Director of Argonne's Center for Transportation Research, welcomes President Obama to the podium during his visit to the lab on March 15, 2013.

Nuclear engineer Laural Briggs reviews pressure distribution results from a 217-pin fuel assembly simulation. The simulation was computed by Argonne's Nek5000 large eddy simulation tool on the IBM Blue Gene/P Intrepid supercomputer.

Argonne's Lynn Trahey prepares lithium-oxygen batteries for controlled environment testing.

Yuko Shiroyanagi (right) and Chuck Doose of the Accelerator Science Division prepare the magnetic measurement test stand. Testing ensures that the super-conducting undulator for the Advanced Photon Source upgrade will meet the high-precision requirements needed to generate the world's brightest X-rays above energies of 25 keV.

Agronomist with plant Royalty Free Stock Photo

Nanoscientist Tijana Rajh (far right) holds a strip of material created from titanium dioxide nanotubes. Her research team at Argonne's Center for Nanoscale Materials includes, from left, Hui Claire Xiong, Sanja Tepavcevic and Elena Shevchenko.

Ramallah - رام الله : RAMALLAH - A Palestinian woman of Ramallah in traditional embroidered dress, circa 1920s (Per Reem Ackall)

السوق القديمة، حي الوطاة، البلدة التحتا صفد، فلسطين ١٩٤٠ The old market, AlWata neighborhood, downtown Safad, Palestine 1940

Karima Aboud