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Sunday
Judah (left) and Josh Ridgeway drill a hole in the Tanana River at Nenana, Alaska to measure the thickness of the ice on April 13th. Dan Bross/KUAC hide caption
Here's a kale salad and sweet potato that did get their portraits taken in the name of medical research. Courtesy of Brandie Jefferson hide caption
Saturday
The Peoples Climate March, is being billed as a mobilization for climate, jobs and justice. Windsor Johnston/NPR hide caption
Thursday
The avocados on the right are Hass, America's favorite variety of the green fruit. At left are GEM avocados, the great-granddaughter of the Hass. GEM avocados grow well in California's Central Valley and, in taste tests, they scored better than the Hass in terms of eating quality. Ezra David Romero/Valley Public Radio hide caption
A Washington, D.C., Metropolitan Police officer wears a camera during a news conference in 2014. Win McNamee/Getty Images hide caption
Images from NASA's Cassini spacecraft show the closest-ever views of Saturn's swirled atmosphere and its massive hurricane. NASA/JPL-Caltech/Space Science Institute hide caption
The elaborate Alnwick Garden in northeast England includes a "Poison Garden" that showcases plants with killer properties. Visitors are invited to look but not touch or even smell. Joanne Silberner for NPR hide caption
An image taken on July 19, 2013, by the wide-angle camera on NASA's Cassini spacecraft captured Saturn, its rings and planet Earth, which is the tiny dot in the lower right. NASA/JPL-Caltech/Space Science Institute hide caption
Wednesday
Postpartum hemorrhage is the leading cause of maternal deaths around the world. Thomas Fredberg/Getty Images/Science Photo Library hide caption
Scientists placed two clusters of cultured forebrain cells side by side (each cluster the size of a head of a pin). Within days, the "minibrains" had fused and particular neurons (in green) migrated from the left side to the right side, as subsets of cells do in a real brain. Courtesy of Pasca lab/Stanford University hide caption
(Left) A close-up view of a spirally fractured mastodon femur. (Right) A boulder discovered at the Cerutti Mastodon site in San Diego County thought to have been used by early humans as a hammerstone. Tom Démeré/San Diego Natural History Museum hide caption
New Evidence Suggests Humans Arrived In The Americas Far Earlier Than Thought
NASA's Cassini spacecraft made its first dive between Saturn and its rings early Wednesday, as the final act in a nearly 20-year mission. NASA/JPL-Caltech hide caption
The Energy Star program started in 1992 to rate the efficiency of computer monitors and now covers dozens of product categories. Paul Sakuma/AP hide caption