Clean Water Services held a brewing competition in Sept. 2014, inviting 13 homebrewers to make beer from its purified wastewater (as well as water from other sources). Now the company is asking the state for permission for brewers to use its wastewater product exclusively to make beer. /Courtesy of Clean Water Services hide caption

itoggle caption /Courtesy of Clean Water Services

Cattle in holding pens at the Simplot feedlot located next to a slaughterhouse in Burbank, Washington on Dec. 26, 2013. Merck & Co Inc is testing lower dosages of its controversial cattle growth drug Zilmax drug in an effort to resume its sales to the $44 billion U.S. beef industry. Ross Courtney/Reuters/Landov hide caption

itoggle caption Ross Courtney/Reuters/Landov

High school athlete Graham Hill, number 50, suffered a concussion in 2013 while playing football at Trinity Christian Academy in Addison, Texas. Courtesy of Jeffrey McWhorter hide caption

itoggle caption Courtesy of Jeffrey McWhorter

Ultrasound is often used for prenatal screening. It's just one of several prenatal screenings available to pregnant women. iStockphoto hide caption

itoggle caption iStockphoto

A polar bear walks in the Arctic National Wildlife Refuge.The Obama administration is proposing new protections in the region that would ban mining and drilling. Subhankar Banerjee/AP hide caption

itoggle caption Subhankar Banerjee/AP

As the U.S. workforce continues to become more diverse, researchers are now more than ever examining diversity and bias in the work place. iStockphoto hide caption

itoggle caption iStockphoto

When he was 59 years old, Greg O'Brien was diagnosed with early-onset Alzheimer's disease. Five years later, he is speaking publicly about his experience, even as his symptoms worsen. Courtesy of Greg O'Brien hide caption

itoggle caption Courtesy of Greg O'Brien

Allagash Brewing microbiologist and head of quality control Zach Bodah's favorite microscope picture of Brettanomyces (taken in house). The culture comes from Confluence Ale and is a blend of the Allagash house yeast and Brett yeast. Courtesy of Zach Bodah/Allagash hide caption

itoggle caption Courtesy of Zach Bodah/Allagash