Parkinson's disease, smoking, certain head injuries and even normal aging can influence our sense of smell. But certain patterns of loss in the ability to identify odors seem pronounced in Alzheimer's, researchers say. CSA Images/Color Printstock Collection/Getty Images hide caption

toggle caption CSA Images/Color Printstock Collection/Getty Images

A Sniff Test For Alzheimer's Checks For The Ability To Identify Odors

  • Download
  • <iframe src="https://www.npr.org/player/embed/487391863/487522870" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Four sheep cloned from the same genetic material as Dolly roam the paddocks in Nottingham, England. The University of Nottingham hide caption

toggle caption The University of Nottingham

'Clone Sisters' Of Dolly The Sheep Are Alive And Kicking

  • Download
  • <iframe src="https://www.npr.org/player/embed/487047575/487522876" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Larry Is One Lucky Lobster

  • Download
  • <iframe src="https://www.npr.org/player/embed/487446694/487446695" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Bandar, a male tiger, plays with a ball made of tough plastic in the pool to keep cool on a hot day at the National Zoo. Courtesy of Smithsonian's National Zoo hide caption

toggle caption Courtesy of Smithsonian's National Zoo

How Does A Tiger Keep Cool In This Heat? One Word: Bloodsicles

  • Download
  • <iframe src="https://www.npr.org/player/embed/487357874/487380963" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

At Ulva Island Bird Sanctuary on Stewart Island, New Zealand, a sign warned visitors in 2008 to check their bags. The fight against invasive predators continues. Wolfgang Kaehler/LightRocket via Getty Images hide caption

toggle caption Wolfgang Kaehler/LightRocket via Getty Images

A typical hoverfly (Spilomyia diophthalma) Fredrik Sjöberg/Fredrik Sjöberg hide caption

toggle caption Fredrik Sjöberg/Fredrik Sjöberg

The Uppermost Aristocracy of the Hoverfly Society

  • Download
  • <iframe src="https://www.npr.org/player/embed/486731588/487151585" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Yao honey hunter Orlando Yassene holds a male greater honeyguide temporarily captured for research in the Niassa National Reserve, Mozambique. The birds will flutter in front of people, tweet and fly from tree to tree to guide hunters to bees' nests that are hidden inside the trunks of hollow trees. This teamwork could date back thousands or even a million years. Claire Spottiswoode hide caption

toggle caption Claire Spottiswoode

How Wild Birds Team Up With Humans To Guide Them To Honey

  • Download
  • <iframe src="https://www.npr.org/player/embed/486471339/486933704" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Larry, the chief mouser to the Cabinet Office, prowls outside the door of No. 10 Downing St. in London earlier this month. Oli Scarff/AFP/Getty Images hide caption

toggle caption Oli Scarff/AFP/Getty Images

By hanging a caged chicken near mosquito traps in bedrooms in three Ethiopian villages, researchers hoped to learn how the insects react to the scent of a fowl. Kassahun Jaleta/Courtesy of Rickard Ignell hide caption

toggle caption Kassahun Jaleta/Courtesy of Rickard Ignell

Hundreds Of Endangered Toads Released Into Southeast Wyoming

  • Download
  • <iframe src="https://www.npr.org/player/embed/486646168/486646169" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Zika virus particles (colored purple in this scan) infecting cells. Each particle is about 40 nanometers in diameter. CDC/Smith Collection/Gado/Getty Images hide caption

toggle caption CDC/Smith Collection/Gado/Getty Images

A Case Of Zika Apparently Spread From A Patient To A Family Caregiver

  • Download
  • <iframe src="https://www.npr.org/player/embed/486486050/486531858" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

New Research Debunks The Dinosaur's Roar

  • Download
  • <iframe src="https://www.npr.org/player/embed/486279631/486279632" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript