In today’s newsletter: Here are the signs of colon cancer. Plus, why you should eat more lentils and peas, how to protect yourself from ticks, and if science can reverse graying hair.

But first: Are you a mosquito magnet? Here’s what you can do about it.  

MICROGRAPH BY DR TONY BRAIN, SCIENCE PHOTO LIBRARY

If you’re usually the only one covered in mosquito bites, here is some news for you: Research proves these bloodsuckers can pick you out in a crowd. Here are the odors they’re drawn to and—more importantly—what scientists recommend to keep them away.

More stories:
— The best mosquito repellents, from sprays to lotions
— Why hiking is uniquely beneficial for your body and your brain

PHOTOGRAPH BY SCIENCE SOURCE

Among adults younger than 50, research shows that heart attacks are becoming more prevalent—and the outcomes are worse for women. But there is good news: We know how to prevent them.

More stories: 
— Colon cancer is rising among young adults. Here are signs to watch for. 
— This rare disorder is a leading cause of blindness in young people  

PHOTOGRAPH BY BY INGE NANDRUP-BUS, GETTY IMAGES 

PHOTOGRAPH BY BY KEENPRESS 

Graying hair is one of the most visible signs of aging. And covering them up is a multibillion-dollar business worldwide, promising only a temporary reprieve from the passage of time. But why does hair gray, anyway—and will science one day find a way to reverse it?

More for your hair:
— How we should really be using castor oil 
— Experts explain what drives hair loss—and how to fix it  

BEFORE YOU GO: Does that glass of wine hit differently than it did a few years ago? Here’s why your alcohol tolerance diminishes as you age.

Today’s newsletter was edited and curated by Jennifer Baik and produced by Amanda Williams-Bryant. Did someone forward this to you? Sign up here to get this newsletter and more.