A leopard frog catches a cricket using its sticky tongue. Courtesy of A. Noel and D.L. Hu/Georgia Institute of Technology hide caption

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Tuesday
Satellite imagery of Machu Pichu in Peru, taken in June 2016. DigitalGlobal2017 hide caption
Secretary of Homeland Security John Kelly answers questions during a news conference on Tuesday in Washington, D.C. Drew Angerer/Getty Images hide caption
Oprah Winfrey listens as then-President Obama introduces her during a presentation ceremony for the Presidential Medal of Freedom in 2013 at the White House. Brooks Kraft/Corbis via Getty Images hide caption
Gov. Bill Haslam and his wife, Crissy, leave the House chamber after Haslam gave his annual State of the State address in Nashville on Monday. Haslam is looking to expand a free community college program to include adults. Mark Humphrey/AP hide caption
Monday
For years, the satellites that make up America's Global Position System have been carrying sensors that measure the weather in space. This image illustrates the orbital planes in which GPS satellites travel around Earth. Courtesy of Los Alamos National Laboratory hide caption
An artist's impression of Saccorhytus coronarius, a sea creature that lived 540 million years ago. Jian Han, Northwest University, China hide caption
Scientists Describe Ancient Bag-Like Sea Creatures From China
Saturday
Serena Williams holds the winner's trophy following her victory in the women's singles final in the Australian Open in Melbourne Saturday. Paul Crock/AFP/Getty Images hide caption
Friday
Rafael Nadal throws his towel to a ball boy during his semifinal against Bulgaria's Grigor Dimitrov at the Australian Open. Kin Cheung/AP hide caption
Thursday
A shot of the crime haiku, smack in the middle of the popular "Cops and Robbers" section of The Enterprise-Tocsin. Courtesy of Charlie Smith hide caption
The Bulletin of the Atomic Scientists announced during a news conference Thursday that its advisory group is moving the Doomsday Clock 30 seconds closer to midnight. Bulletin of the Atomic Scientists hide caption
Venus Williams, 36, will face off against her sister Serena, 35, in Saturday's Australian Open final. Williams beat fellow American Coco Vandeweghe Thursday to reach the finals. Dita Alangkara/AP hide caption
Wednesday
Actors Mary Tyler Moore and Ted Knight laugh in a still from The Mary Tyler Moore Show in 1976. 20th Century Fox Television/Fotos International/Getty Images hide caption
She Turned The World On With Her Smile: Mary Tyler Moore Dies At 80
Allman Brothers drummer Butch Trucks, seen here receiving a Grammy Award in 2012, died Tuesday, according to a statement from his publicist. Toby Canham/Getty Images hide caption
Robby Kelley, seen here during a race in Kitzbuehel, Austria, this weekend, gained some new fans for refusing to quit in another World Cup slalom race Tuesday night. Alexis Boichard/Agence Zoom/Getty Images hide caption