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We can look at the value of the things we buy and sell.
Fish swim in a reef at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands.
AP Photo/Jacob Asher
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.
Black holes use gravity to pull matter into them.
NASA/Chandra X-ray Observatory/M.Weiss via AP
Pictures of black holes have a white outline around them when photographed, due to one of black holes’ unique and key features.
A full set is two on the top and two on the bottom.
Sebastian Kaulitzki/Science Photo Library via Getty Images
Two dental experts explain that these furthest-back molars may be a not-so-necessary leftover from early human evolution.
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Kian, age 6, has some interesting questions about farts that we’re probably all wondering about.
Matter in deep space is very spread out, which makes it impossible for any sound waves to travel.
NASA, ESA, CSA, STScI
Sound needs matter to propagate, so the vast vacuum of space is not just empty − it’s silent.
Spreading rumors about others is one form of bullying.
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No matter your age, if you’re being bullied − there’s help out there.
Two crystalline materials together: kyanite (blue) embedded in quartz (white).
Photo 12/Universal Images Group via Getty Images
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.
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The process of digestion actually starts before you eat anything! Tummy rumbles can too.
If traveling into the past is possible, one way to do it might be sending people through tunnels in space.
by raggio5 via Pixabay
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.
Use a tissue and wash your hands after a booger explosion.
Joshua Wachs/Flickr
Slimy snot is an important part of how your immune system wards off germs and fights back from infection.
Remember the old saying: Extraordinary claims require extraordinary evidence.
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Ghosts can be spooky fun, but there’s no evidence they exist.
Today, nearly all U.S. teens have a smartphone.
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Up to 50% of US teens feel they are addicted to their devices. But help is out there.
This age old question has been dubbed Olbers’ paradox.
John Moore via Getty Images News
An astronomer explains why space looks so dark despite containing 200 billion trillion stars.
People learn balance as they grow – and can usually improve their balance with practice.
uzhursky/iStock via Getty Images
Balancing well is a whole-body experience that develops over time and takes practice to master.
Astronomers can estimate ages for stars outside the Solar System, but not planets.
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Measuring the ages of planets and stars is tricky. An observational astrophysicist describes the subtle clues that provide good estimates for how old different space objects are.
Without a point of reference, it can be hard to tell just how fast an airplane is traveling.
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An aerospace engineer explains why it’s so hard to tell just how fast an airplane is really moving.
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Evolutionary biology and the fossil record reveal a great deal about the origins of chickens and eggs.
Your bladder can signal the brain when it’s full, even while you’re asleep.
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A pediatric urologist explains how the bladder and the brain communicate to wake you up when you need to ‘go’ – and how that communication might break down.
Some animals, including goats, regularly give birth to two babies at once.
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Animals often give birth to litters of more than one offspring at a time. But are those babies twins?