A peak flow meter is a handheld device that measures airflow rate and can help those with respiratory conditions like asthma monitor their condition.

From the colors you wear to the sounds and scents around you, small sensory choices can influence your mood, lower stress, and build emotional balance.

Light is fast, but travels in long wavelengths and interacts weakly with itself. The particles that make up matter are tiny and interact strongly with each other, but move slowly. Together, the two ...

These intimacy factors offer a soft road map to intimacy. Each factor is vague enough that there is the opportunity to explore each for further specification, investigation, and discussion. In doing ...

To read your blood pressure measurements, it's important to know what's considered hypertension, and when you should seek medical attention.

When optical materials (molecules or solid-state semiconductors) are embedded in tiny photonic boxes, known as optical microcavities, they form hybrid light-matter states known as polaritons. Most of ...

Emerging technologies, such as functional near-infrared spectroscopy, offer in-office real-time monitoring for potential clinical application. The future is arriving.

This story appears in the March 2018 issue of National Geographic magazine. The kaleidoscopic ball above is more—and less—than meets the eye. This vivid terrain is actually a color-coded Zika virus, ...