How many stars are there in space?

Scientists have a good estimate on the staggering number of stars in the universe.

Brian Jackson, Associate Professor of Astronomy, Boise State University • conversation
Sept. 20, 2021 ~5 min

What happens when your foot falls asleep?

An exercise physiologist explains how it’s a problem of communication between your brain and your body.

Zachary Gillen, Assistant Professor of Exercise Physiology, Mississippi State University • conversation
Sept. 13, 2021 ~5 min

Why are planets round?

Gravity, mass and centrifugal force all contribute to the final shape of a planet.

James Webb, Professor and Director, Stocker AstroScience Center for Physics; Stocker AstroScience Center, Florida International University • conversation
Sept. 7, 2021 ~4 min

What happens when the COVID-19 vaccines enter the body – a road map for kids and grown-ups

An infectious disease doctor explains the science behind COVID-19 vaccines at a level that children – and adults – of all ages can understand.

Glenn J Rapsinski, Pediatric Infectious Diseases Fellow, University of Pittsburgh • conversation
Aug. 30, 2021 ~8 min

How would planting 8 billion trees every year for 20 years affect Earth's climate?

Planting a massive number of trees can help slow climate change, but it is only part of the solution.

Karen D. Holl, Professor of Restoration Ecology, University of California, Santa Cruz • conversation
Aug. 23, 2021 ~6 min

Is drinking good for you in any way? If not, why is alcohol legal for adults?

Consuming alcohol makes accidents more likely and it can harm your heart, your liver and even change your brain. But making the sale of beer, wine and hard liquor illegal flopped.

Margie Skeer, Associate Professor of Public Health and Community Medicine; Weiner Hailey Family Professor, Tufts University • conversation
Aug. 9, 2021 ~6 min

What will the Earth be like in 500 years?

The Earth is constantly changing in natural ways, but most of those changes are very slow. Humans are speeding up other changes with global warming.

William D. MacDonald, Professor Emeritus, Department of Geological Sciences, Binghamton University, State University of New York • conversation
Aug. 2, 2021 ~6 min

Why does gravity pull us down and not up?

Gravity is something every person on Earth intuitively understands: It is what keeps you on the ground. But how come gravity pulls down, rather than pushes up? Einstein came up with the answer.

Mario Borunda, Associate Professor of Physics, Oklahoma State University • conversation
July 26, 2021 ~5 min

Are there any planets outside of our solar system?

Billions of galaxies are in the universe, with billions of stars in every galaxy. Could billions of planets be out there too?

Jean-Luc Margot, Professor of Earth, Planetary, and Space Sciences, University of California, Los Angeles • conversation
July 19, 2021 ~7 min

A pediatric nurse explains the science of sneezing

People sneeze for many reasons and in many ways. One of them is to protect your airways from irritants and infectious disease.

Meg Sorg, Clinical Assistant Professor of Nursing, Purdue University • conversation
June 28, 2021 ~6 min