Science is showing that how you feel isn’t just about what you eat, or do, or think. It’s about what you believe. And that belief can affect everything: It can improve the immune system, decrease blood pressure, add years to our lives. But why, and how?
In the U.S., it’s held up as a fitness regimen, a path to transformation or enlightenment, and a treatment for so much that ails us—from addiction, headaches, and hearing loss to post-traumatic stress disorder, and heart disease.
Colon cancer has doubled among adults under age 55. Genetics, the microbiome, and low screening rates may be factors in the increase, experts say. Here are risk factors for the disease—and the most common symptoms.
PHOTOGRAPH BY REBECCA HALE AND MARK THIESSEN, NATIONAL GEOGRAPHIC
Which houseplants should you buy to purify the air? Popular home décor websites list a number of plants that promise to remove toxins and dangerous chemicals from the air, and several online retailers market air-purifying plants to consumers. What do scientists say, though?
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