Rock dust is only part of the story of soil. Living creatures, many of them too tiny to see, keep that soil healthy for growing everything from food to forests.
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People have been flying airplanes for well over a century. Engineers know how to balance all the forces at play, but still aren’t exactly sure how some of the physics of flight actually works.
Trees – and all plants – harvest sunlight to gain the energy they need to live and grow.
A queen’s main job in the hive is to lay eggs and pass genes on to offspring. But many bee species do just fine without queens or big colonies.
There are an infinite number of paths an ice crystal can take before you touch it.
Humans have synced their calendars to the sun and moon for centuries, but every so often, these systems need a little correction.
Stopping someone against their will can be false imprisonment or even kidnapping. There are laws that determine who is acting as a hero and who is acting as a vigilante.
Inhaling air is how you get the oxygen your body needs to turn your food into energy. Other living things use different strategies.
Turns out ‘A’ didn’t have to be the first letter in the alphabet, nor ‘Z’ the last.
Lots of factors can influence your music taste, from your age and where you’re from to the personality traits you have.
Your immune system is often able to fend off pathogens it’s never seen before. But defending your body against all of them all at once is a tough challenge.
There are so many fish in the ocean that if you took them out, important habitats and food sources for many creatures would be lost.
Pictures of black holes have a white outline around them when photographed, due to one of black holes’ unique and key features.
Two dental experts explain that these furthest-back molars may be a not-so-necessary leftover from early human evolution.
Sound needs matter to propagate, so the vast vacuum of space is not just empty − it’s silent.
No matter your age, if you’re being bullied − there’s help out there.
There are a lot of myths about crystals − for example, that they are magical rocks with healing powers. An earth scientist explains some of their amazing true science.
Scientists are trying to figure out if time travel is even theoretically possible. If it is, it looks like it would take a whole lot more knowledge and resources than humans have now to do it.
Slimy snot is an important part of how your immune system wards off germs and fights back from infection.
Ghosts can be spooky fun, but there’s no evidence they exist.
Top contributors
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Distinguished Professor Emeritus of Anthropology, Binghamton University, State University of New York
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Assistant Professor of Astronomy and Astrophysics, University of Maryland, Baltimore County
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Professor of Astronomy, UMass Lowell
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Professor of Biology, Clarkson University
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Associate Professor of Veterinary Clinical Sciences, Oklahoma State University
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University Distinguished Professor of Astronomy, University of Arizona
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Doctoral Student in Biomedical Sciences, University of South Carolina
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Lecturer in Geosciences, University of Montana
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Assistant Professor of Gastroenterology and Hepatology, School of Medicine, University of Washington
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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 Biological Anthropology, University of Tennessee
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Professor and Chair of History Department, Colorado State University
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Vice President of Academic Affairs and Dean of the College, Grinnell College
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Associate Professor of Physics, University of Richmond
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Associate Professor of Astronomy, Boise State University