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Welcome to day two of National Geographic’s Wonder Lessons, your month-long guide to the natural world. Today, learn how to find Polaris, our North Star.

In this week’s Health newsletter: Everyday herbs are packed with a surprising number of health benefits, what psychedelics actually do to the brain, the changing science on how much exercise is safe while pregnant, and can you protect your skin from climate change?

But first: Why eight hours of sleep may not be enough anymore.

THE BIG STORY

Using a tablet at night may feel like rest, but exposure to light and ongoing stimulation can keep the brain in a state of alertness, even as the body winds down.

DANIL NEVSKY STOCKSY

From delayed cortisol rhythms to digital overload, scientists are uncovering why modern life disrupts the body’s ability to truly rest.

WHAT THE SCIENCE SAYS

An image of a yellow vertical rectangle on a white background.

IN THE SPOTLIGHT

Herbs are antioxidant powerhouses—and mounting evidence suggests they can help protect against cardiovascular disease, cancer, inflammation, and more.

VISUSCHAK, GETTY IMAGES

THE SURPRISING HEALTH BENEFITS OF EVERYDAY HERBS

These leafy greens are loaded with flavor and nutrients—and studies show that even small doses are filled with compounds that reduce inflammation and even protect against cancer.

HOW HERBS WORK THEIR MAGIC

TOP HEADLINES

A new analysis broadens our understanding of psychedelics, such as the psilocybin produced by the mushrooms above, and how they affect the brain.

JAHI CHIKWENDIU, THE WASHINGTON POST/GETTY IMAGES

Here's what psychedelics actually do to the brain

How much exercise is safe during pregnancy? New research offers answers

How a warming planet is wreaking havoc on your skin

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

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