Mars is the fourth planet from the Sun and one of our closest neighbors in space. But it’s not a very welcoming place for an Earthling to visit.
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With nine brains, blue blood and a talent for camouflage, the octopus is one of the most fascinating creatures in the sea.
You can’t photograph the inside of a twister, but radar offers some clues.
A computer security expert explains how keys work – and how they are like passwords.
The Earth is a resilient planet, but people are altering it in ways that may take centuries to reverse.
A veterinary ophthalmologist explains what’s going on.
The dwarf planets in our Solar System are cold, dark, far away and full of surprises.
Cockroaches have been on Earth far longer than humans and may outlast us. Here are a few reasons why.
It may have had something to do with protecting female purity. No official statute clearly required men to do all the acting back then.
These coordinated movements of a flock of starlings follow no plan or leader. Scientists used to think the animals must communicate via ESP to create these fast-moving blobs.
Who are the Ukrainians and when were they part of the same empire as Russia? A scholar answers basic questions on war in Ukraine.
As long as you don’t tune out the world and protect your hearing, it’s hard to overdo it.
Hard and strong, or bendy and flexible? A cartilaginous skeleton provides advantages in the ocean, but wouldn’t stand up to life on land.
Poop comes in many shapes, sizes and textures. The kind that’s too runny might be the result of wayward germs, Crohn’s disease or lactose intolerance.
That brownish/yellowish gunk that comes out on your finger if you scratch deep inside your ear? It actually serves an important purpose in your body.
Blood plays a vital role in keeping us alive, from delivering oxygen to the body’s organs to fighting off infections.
How did penguins end up with so few bones – and become lightning-fast swimmers?
Plants need light to feed themselves, so they grow in ways that help them collect as much of it as they can. Sometimes that’s straight up, but not always.
A healthy diet can include some candy. But if you eat too much, it can interfere with your appetite for the stuff your body actually needs.
Volcanoes might seem like nature’s incinerators, but using them to burn up trash would be dangerous and disrespectful to indigenous people who view them as sacred.
Top contributors
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Professor of Astronomy, UMass Lowell
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Professor of Biology, Clarkson University
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Distinguished Professor Emeritus of Anthropology, Binghamton University, State University of New York
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Associate Professor of Physics, University of Richmond
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Associate Professor of Veterinary Clinical Sciences, Oklahoma State University
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Assistant Professor of Physics and Astronomy, Rochester Institute of Technology
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Doctoral Student in Biomedical Sciences, University of South Carolina
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Executive Dean of the College of Arts, Sciences & Education and Professor of Biological Sciences, Florida International University
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Assistant Professor of Gastroenterology and Hepatology, School of Medicine, University of Washington
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Huffington Foundation Professor of Economics and Environmental Studies, Wesleyan University
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Associate Professor of Public Health and Community Medicine; Weiner Hailey Family Professor, Tufts University
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Professor of Earth and Space Sciences, University of Washington
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Cornelia H. Dudley Professor of Psychology, Knox College
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Postdoctoral Research Associate, Florida International University
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Associate Professor of Health and Wellness Studies, Binghamton University, State University of New York
