Every bit of steel in the car you drive has been measured as to its capability to withstand certain forces — pushing and pulling. Machines like this do the measuring.Jennifer Lauren Lee/NIST PMLhide caption
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toggle captionJennifer Lauren Lee/NIST PML
Oklahoma Gov. Mary Fallin, pictured here in February, has not indicated whether she plans to sign the bill into law.J Pat Carter/APhide caption
A man waves a rainbow flag in Austin, Texas, after the U.S. Supreme Court ruled same-sex couples have the right to marry.Eric Gay/APhide caption
Oklahoma Gov. Mary Fallin walks on the floor of the Oklahoma House on Wednesday. On Friday, Fallin vetoed legislation that would make it a felony for doctors to perform an abortion. Sue Ogrocki/AP hide caption
University of Florida researchers recently published a paper showing that captured reptiles in 2009, 2011 and 2014 are Nile crocs. Joe Wasilewski/AP hide caption
Mexico's most wanted drug lord, Joaquin "El Chapo" Guzmán, stands for his prison mug shot at the Altiplano maximum security federal prison in Almoloya, Mexico. AP hide caption
Mars, as photographed by the Hubble Space Telescope this month as Mars and Earth approached opposition. NASA hide caption
Supporters of Iraqi cleric Muqtada al-Sadr chant slogans after breaking into Baghdad's fortified Green Zone on Friday. Ahmad al-Rubaye /AFP/Getty Images hide caption
A member of Doctors Without Borders looks out over the general hospital in the Central African Republic's capital city, Bangui, in April 2014. Issouf Sanogo/AFP/Getty Images hide caption
People cross a temporary bridge on a parched area of the Ganges River in Allahabad, India, on Thursday. Pacific Press/LightRocket via Getty Images hide caption
Environment and Public Works Committee Chairman Sen. James Inhofe, R-Okla., speaks with Sen. Barbara Boxer, D-Calif., on Thursday before joining a bipartisan group of senators at a Capitol Hill news conference to discuss legislation to improve the federal regulation of chemicals and toxic substances. J. Scott Applewhite/AP hide caption
For more than 70 years, the false bottom on this mug hid a Holocaust victim's treasures. Mirosław Maciaszczyk/Auschwitz Museum hide caption
For 70 Years, A Mug In Auschwitz Held A Secret Treasure
Taiwan President Tsai Ing-wen smiles at the crowd on Friday during her inauguration in Taipei, Taiwan. Ashley Pon/Getty Images hide caption
New York's Utica City School District has reached a settlement in a federal lawsuit that says it discriminated against refugee students and did not let them enroll at Thomas R. Proctor High School, shown here. Hansi Lo Wang/NPR hide caption
Every bit of steel in the car you drive has been measured as to its capability to withstand certain forces — pushing and pulling. Machines like this do the measuring. Jennifer Lauren Lee/NIST PML hide caption
How Do You Lift A Million Pounds Of Stainless Steel? Very Carefully
Planes sit on the tarmac at Cairo's airport Thursday after an EgyptAir flight from Paris to Cairo disappeared over the Mediterranean with 66 people onboard. Khaled Desouki/AFP/Getty Images hide caption
San Francisco Police Chief Greg Suhr resigned on Thursday after losing the support of Mayor Ed Lee, who had backed him despite several racially-charged incidents in the department. Eric Risberg/AP hide caption
Oklahoma Gov. Mary Fallin, pictured here in February, has not indicated whether she plans to sign the bill into law. J Pat Carter/AP hide caption
The cracked-dry bed of the Almaden Reservoir in San Jose, Calif., in 2014. Marcio Jose Sanchez/AP hide caption
A man waves a rainbow flag in Austin, Texas, after the U.S. Supreme Court ruled same-sex couples have the right to marry. Eric Gay/AP hide caption
Filipino boxing great Manny Pacquiao holds his Certificate of Canvass as he is proclaimed the seventh senator by Commissioner Christopher Lim (right) in a ceremony Thursday. Bullit Marquez/AP hide caption
A fly-size robot perches on a leaf. Carla Schaffer/AAAS hide caption