A new study finds that radio waves from a cell phone can affect the metabolism of brain cells, though there is no evidence that the effect is harmful. Here, a pedestrian talks on her phone on a street in San Francisco. Justin Sullivan/Getty Images hide caption

toggle caption Justin Sullivan/Getty Images

Cell Phone Radio Waves Excite Brain Cells

  • Download
  • <iframe src="https://www.npr.org/player/embed/133968220/133973066" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Jaime Guevara-Aguirre stands with some of the people who took part in his study of Laron syndrome in Ecuador. Courtesy of Valter Longo hide caption

toggle caption Courtesy of Valter Longo

Gene Mutation Key To Ecuador Group's Health

  • Download
  • <iframe src="https://www.npr.org/player/embed/133817590/133832032" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript
Elizabet Spaepen, University of Chicago

Without Language, Large Numbers Don't Add Up

  • Download
  • <iframe src="https://www.npr.org/player/embed/133601966/133614318" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Malcom Brown (left) is hit by Jake Smith on a kickoff return during a high school state championship game in Arlington, Texas, in December. Sports medicine professionals and the NFL are calling for tougher regulations on head injuries sustained by young athletes. Matt Strasen/AP hide caption

toggle caption Matt Strasen/AP

Doctors Throw Flags On High School Concussions

  • Download
  • <iframe src="https://www.npr.org/player/embed/133437361/133443140" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

A hormone that impacts memory in rats likely does the same thing in other animals, like humans. S. Ugur Okcu/iStockphoto.com hide caption

toggle caption S. Ugur Okcu/iStockphoto.com

Hormone Helps Short-Term Memories Stick Around

  • Download
  • <iframe src="https://www.npr.org/player/embed/133237596/133249582" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Modern bedbugs are increasingly resistant to pesticides. Some populations, in fact, can survive 1,000 times the amount of pesticide that would be needed to kill a traditional bug. Orkin LLC/AP hide caption

toggle caption Orkin LLC/AP

Bedbug Genome Reveals Pesticide Resistance

  • Download
  • <iframe src="https://www.npr.org/player/embed/133057071/133061510" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

In Highlighting Radon's Risks, Context Needed

  • Download
  • <iframe src="https://www.npr.org/player/embed/132914377/132924309" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Doctors Monitor Rep. Giffords' Brain For Swelling

  • Download
  • <iframe src="https://www.npr.org/player/embed/132826333/132826308" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

How Neurosurgeons Size Up Brain Injuries Like Giffords'

  • Download
  • <iframe src="https://www.npr.org/player/embed/132810638/132812676" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

People with autism have impaired feelings of trust and empathy, and early studies show that the hormone oxytocin could help. Steven van Soldt/iStockphoto.com hide caption

toggle caption Steven van Soldt/iStockphoto.com

Scientists Test 'Trust Hormone' For Autism Fight

  • Download
  • <iframe src="https://www.npr.org/player/embed/132473913/132613612" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Fear The Prius? A Toyota Prius hybrid model car waits for customers at a Toyota dealer in Hollywood, Calif., on March 10. Concerns about the cars suddenly accelerating dogged the company earlier this year. Mark Ralston/AFP/Getty Images hide caption

toggle caption Mark Ralston/AFP/Getty Images

The Year In Fear: Fright Or Fallacy?

  • Download
  • <iframe src="https://www.npr.org/player/embed/132410705/132443287" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Residents of Times Beach, Mo., were forced to leave their town in December 1982 because the chemical dioxin was found in the soil. Thirty years later, the Environmental Protection Agency can't decide how dangerous the chemical is. Bill Pierce/Time & Life Pictures/Getty Images hide caption

toggle caption Bill Pierce/Time & Life Pictures/Getty Images

A Chemical Conundrum: How Dangerous Is Dioxin?

  • Download
  • <iframe src="https://www.npr.org/player/embed/132368362/132393708" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Mono Lake, Calif., is home to a bacterium discovered by NASA scientists that can eat and grow on arsenic instead of phosphorous, one of the basic building blocks of life. The finding has implications for NASA's ongoing search for signs of life elsewhere in the universe. David McNew/Getty Images hide caption

toggle caption David McNew/Getty Images

Scientists Find Bacterium That Survives On Arsenic

  • Download
  • <iframe src="https://www.npr.org/player/embed/131761687/131774124" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Eggs of the parasite called the human whipworm, responsible for Trichuriasis, a disease that affects the large intestine and causes gastrointestinal problems. Drug companies are now trying to create parasites for treating inflammatory bowel disease. Public Health Image Library/CDC hide caption

toggle caption Public Health Image Library/CDC

Eat Your Worms: The Upside Of Parasites

  • Download
  • <iframe src="https://www.npr.org/player/embed/131753267/131762074" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Our brains have chemical pathways that make us feel good when we eat, and really good when we eat sweet or fatty foods with high calories. Scientists see these same chemical pathways used in cases of drug addiction. Paul Ellis/AFP/Getty Images hide caption

toggle caption Paul Ellis/AFP/Getty Images

Overeating, Like Drug Use, Rewards And Alters Brain

  • Download
  • <iframe src="https://www.npr.org/player/embed/131698228/131719038" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript