As many as one in six teenagers have self-harmed at some point in their lives. As well as being an indicator of emotional pain, self-harm is also the best-known predictor of death by suicide—yet researchers know little about the emotional and biological factors that lead to it.

There is new hope for people who have lost their smell. Scientists have successfully tested a breakthrough device that lets people detect the presence of certain odors. This innovative system helps them “smell” again by translating odors into feelings (like touch) inside the nose.