An orangutan eats a piece of watermelon at a zoo in Nanning, Guangxi province, China, on Friday. Reuters
Fans of Karrie Webb, who is from Australia, walk to the second hole during the U.S. Women's Open golf tournament at Oakmont Country Club in Oakmont, Pa., on Friday. Mike Groll/AP
NASCAR driver Kurt Busch is reflected in a mirror of his No. 2 car as he talks with a crew member during practice for the NASCAR Lifelock.com 400 auto race at Chicagoland Speedway in Joliet, Ill., on Friday. Skip Stewart/AP
Spectators on Friday cool off in the Arroux river as they watch the pack pass over a bridge in Toulon-sur-Arroux during the sixth stage of the Tour de France starting from Montargis and finishing in Gueugnon, France. Bas Czerwinski/AP
Elephants scuffle at the Elephant National Park in Addo, South Africa, on Friday. Fernando Vergara/AP
Make-up artists prepare model Michaela Kurzova for the Spring/Summer 2011 fashion show for German designer Patrick Mohr at the Berlin Fashion Week on Friday in Berlin. Markus Schreiber/AP
Researchers and biologists place sand around sea turtle eggs they placed in a cooler after harvesting them from the sand in Cape San Blas, Fla., on Friday. US Fish and Wildlife and other authorities are relocating thousands of sea turtle eggs to a warehouse on the East coast of Florida in an effort to save them from the oil from the Deepwater Horizon spill. Dave Martin/AP
People gather near the site of the suicide bombing in Yakaghund in the Pakistani tribal area of Mohmand on Friday. A suicide bomber on a motorcycle struck outside a government office. Mohammad Sajjad/AP
Oil washes ashore on a beach in Waveland, Miss., on Thursday. Tim Isbell/The Sun Herald/AP
A zoo keeper holds a six-week-old Bush Dog pup during a veterinary check-up at Chester Zoo in Britain, on Friday. Phil Noble/Reuters
Ammunition is seen across the chest of an Afghan National Army soldier as United States soldiers from Bravo Company, 2nd Battalion of the 508 Parachute Infantry Regiment of the 82nd Airborne, patrol in the village of Pir-e-Paymal in the volatile Arghandab Valley, outside Kandahar City, Afghanistan, on Wednesday. Kevin Frayer/AP
Butch Stanley, of Hendersonville, N.C., throws the hammer during the Grandfather Mountain Highland Games in Linville, NC, on Friday. Chuck Burton/AP
Fans celebrate as a telecast on an electronic screen outside the American Airlines Arena in Miami shows NBA star LeBron James announcing his free agency plans during an interview on Thursday night. James announced he would be going to the Miami Heat with fellow free agents Chris Bosh and Dwyane Wade after two months of deliberation and endless speculation by the media and fans. Hans Deryk/Reuters
Iva Strakova from the Czech Republic participates in the high jump at the Meeting Ciutat de Barcelona athletics event in Barcelona, Spain, on Friday. David Ramos/AP
At a hacking competition Passcode hosted in Washington, Phyllis Schneck said threats against critical infrastructure "keeps us up at night" – and encouraged young security researchers to partner with the government to help curtail the threat.
The threat of digital attacks on the country's critical infrastructure, such as the power grid or water sector, "keeps us up at night," says Phyllis Schneck, the department of Homeland Security's top cybersecurity official. And she wants young hackers to help the government protect these systems.