If traveling into the past is possible, one way to do it might be sending people through tunnels in space.
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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.
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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.
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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.
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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.
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?
The blow fly’s antenna is a specialized organ that helps the fly detect food quicker than its competitors.
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Flies often beat out competitors for food because of their specialized sensing organs called antennae.
Those puckered prints show up after a while in the water.
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Recent research suggests blood vessels are the key to why fingers and toes turn pruny and pale after being submerged for a while.
Tears prevent your eyes from drying out and protect them from irritation and infection.
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An ophthalmologist explains how important tears are to keeping your eyes feeling good and working well – whether you’re on dry land or swimming in a body of water.
For decades, what lay at the end of this road was a mysterious secret.
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You’re not allowed to visit the part of Nevada known as Area 51. That’s because it’s a top-secret government facility. But the secrecy has to do with spy planes, not space aliens.
Between 2012 and 2021, funding to U.S. tech startups jumped to $344 billion.
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Traditional businesses operate with an established solution to a known problem. Startups focus on a product or service no one else provides.
An artist’s depiction of two astronauts on Mars.
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If an astronaut were to die on Mars, neither cremation nor burial would be good options.
In addition to explaining natural phenomena, math can help strengthen your brain.
Liz Arnold
Math is more than memorizing times tables and doing homework problems. It is woven into more aspects of your life than you might think.
Astronaut Buzz Aldrin planted the U.S. flag on the Moon on July 20, 1969.
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Some people incorrectly say the Moon landings didn’t happen. But the evidence – and logic – isn’t on their side.
Voters often believe they only have two choices in American elections, even when multiple candidates appear on a ballot.
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The United States has a two-party political system because of single-winner plurality voting.
From limited editions to spelling errors, only the rarest Beanie Babies are worth money.
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An expert in high-end collectibles explains why certain items can become valuable – and also how they can lose worth.