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11 Reasons You Missed Your Period (Other Than Being Pregnant)

Louisiana's missing moon rock found in Florida thanks to broken gun

American bumblebee could be officially declared endangered

'Box seats' found at Roman Empire-era arena in Turkey

Lava eruption at Kilauea spews 'Pele's hair' volcanic glass into Hawaii's skies

Canary islanders threatened by toxic gases from lava pouring into the sea

'Flash in the night sky' turns out to be sign of lost Chinese satellite

Who was James Clerk Maxwell? The greatest physicist you've probably never heard of.

These giant birds could eviscerate you. People were raising them 18,000 years ago.

The melting of slush 'glue' threatens to calve large icebergs

Exceptionally rare planet with three suns may lurk in Orion's nose

Our Editors Swear By These Ultra-Flattering Workout Leggings

Five mental health benefits of exercise

Does bike riding work your abs?

How to run properly

Mars on the cheap: Scientists working to revolutionize access to the Red Planet

Bright lava flows, smoke pour from La Palma volcano eruption in new Landsat photos

Running to lose weight: How it really works

How often should you work out?

Boy dies from rare 'brain-eating' amoeba found in splash pad at Texas park

Treadmill vs running outside

'Crocodile-faced hell heron' dinosaur discovered in England

Byzantine warrior with gold-threaded jaw unearthed in Greece

Secret cave chamber may be one of the last Neanderthal hideouts

Will humans ever be immortal?

'Mad Max'-like dust storm envelops Brazilian city in cloud of doom

Superbright aurora lights up Earth’s night side in incredible image from space

8 Latin Women Making Waves in Wellness

10 Foods That Can Cleanse the Liver, According to Science

Are dehumidifiers good for asthma?

How should you sleep during pregnancy?

Do HEPA filters remove viruses?

What is cancer?

Cicadas: Facts about the loud, seasonal insects

Scientists solve the mystery of the Etruscans' origins

Jupiter's Great Red Spot is not only shrinking. Its winds are also speeding up.

Vanishing ice is warping Earth's crust

Did you share the womb with a 'vanishing twin'? The answer may be written in your DNA.

Why did this man have copper-colored rings in his eyes?

Dead humpback whale that beached in New York had human-caused injuries

7 Basic Yoga Poses That You Probably Should Know

What is gait analysis?

Amateur freedivers find gold treasure dating to the fall of the Roman Empire

Levoit 400S air purifier review

Auroras expected tonight in New York, Washington and Wisconsin as solar storm barrels toward Earth

Do air purifiers help with bad smells?

32,000 mph fireball spotted soaring over North Carolina

Should you brush your tongue?

Is treadmill running easier than outdoor running?

Brilliant dashcam fireball videos help scientists find 3 meteorites in Slovenia

Koala-hunting eagle terrorized Australia 25 million years ago

'Russian doll' set of stomach-bursting parasites released inside butterfly on remote Finnish island

Medieval Hebrew document could reveal why Dead Sea Scrolls were found in Qumran

3 Egyptian mummy faces revealed in stunning reconstruction

How radioactive is the human body?

How This London-Based Beauty Brand Founder Gets Ready in the Morning

Scientists pinpoint age of molten 'Einstein ring'

Congress to NASA: What comes after the International Space Station?

What were the largest predators in North America?

12 of the Best Plant-Based Proteins Even Non-Vegetarians Should Eat

Viruses found in Laos bats are closest known relatives to SARS-CoV-2

Half of unvaccinated workers say they'd rather quit than get a shot

Art project creates 'human-alien hybrids' with meteorite-infused water

Which came first: Snake fangs or venom?

Drought in the US Southwest is worst in recorded history

You Might Be Deficient in This Metabolism-Boosting Nutrient—Here's How to Fix It

Recumbent bikes vs upright bikes: What's the difference?

Can dehumidifiers help with snoring?

Is the treadmill good for losing weight?

Are exercise bikes good cardio?

Air purifier vs essential oil diffuser: What's the difference?

Cavers discover snakes and waterfalls inside Yemen's infamous 'Well of Hell' in world-first descent

What is the Air Quality Index?

Is insomnia a sign of pregnancy?

Even mild COVID-19 can shrink the brain, preliminary research finds

Scientists behind tech in mRNA vaccines snag 2nd prestigious prize — is a Nobel next?

'Grandma' killer whale missing from pod, feared dead

Ritualistic artifacts found at 'Temple of the Pharaohs' in Egypt

La Palma volcano eruption's infernal beauty visible from space (Photos)

Are air purifiers safe for pets?

I Was Warned This Natural De-Bloating Elixir Was "Very Serious"—So I Tried It

Peloton vs Echelon: Which exercise bike is better?

Are air purifiers safe for pets?

How to run faster

Sick building syndrome: what to look out for

Earliest conclusive evidence found of humans in the New World

What to eat before a run

Earliest conclusive evidence found of humans in the New World

Astronomers discover enormous 'cavity' in the Milky Way being masked by a cosmic illusion

Solar eclipse looks otherworldly in 'Golden Ring' astrophotography shot

Astrophotographers capture stunning views of the night sky (Photos)

Strange mathematical term changes our entire view of black holes

US to return 'priceless' 3,500-year-old Epic of Gilgamesh tablet to Iraq 20 years after it was stolen

The Taliban may be hunting for Afghanistan's most famous treasure

15 Yoga Shorts That Will Make You Rethink Your Usual Leggings

What does exercise do to your brain?

How to run for longer without getting tired: increase stamina and mental resilience

World's oldest identical twins are 107 years (and 300 days) old

Some dinosaurs may have wagged their tails to help them run

Mountain goat kills grizzly bear by stabbing it with razor-sharp horns

Leafcutter ants back up their bite with metal

NASA unveils landing site on the moon for ice-hunting VIPER rover

Mouth bacteria may explain why some kids hate broccoli

Twilight and the myths of the equinox and 6-month polar night

Ceramic jars full of emeralds found in temple tied to El Dorado, a mythical city of gold

Mars was doomed to desiccation

These Are the Morning Routines to Adopt Before You Turn 40

Are exercise bikes good for weight loss?

Asteroid three times the size of the Statue of Liberty will zoom past Earth on fall equinox

Levoit H132 review

Treasure hunter finds gold hoard buried by Iron Age chieftain

Giant pyramid built by the Maya was made from rock spewed by a volcano

Scientists finally have an explanation for the most energetic explosions in the universe

COVID-19 has now killed as many people in the U.S. as the 1918 Spanish flu

Dozens of endangered penguins killed after being stung in the eyes by swarming honeybees

Space rock that destroyed ancient city may have inspired biblical story of Sodom

Underwater views of Antarctic jellies are 'a magic portal to another world'

12 Signs Your Estrogen Levels Are Low—And What to Do About It

Jupiter just got smacked by a space rock and an amateur astronomer caught it on camera

What is melioidosis?

Wyoming woman catches rare pneumonic plague from cats

La Palma volcano spews lava hundreds of feet in the air, but don't expect a 'mega-tsunami'

Don't miss tonight's full Harvest Moon

Kids' fossilized handprints may be some of the world's oldest art

Ancient bones reveal previously unknown Japanese ancestors

Pfizer says its COVID-19 vaccine is safe and effective for younger kids

Soggy rodents tangle their tails in one big knot in horrifying 'rat king' video

Are left-handed people smarter?

The Best Leggings for Every Kind of Workout

Who was Herodotus?

Why do the planets in the solar system orbit on the same plane?

This Is the One Thing That Finally Cleared My Eczema—and It's Not a Product

SpaceX Inspiration4 astronauts return to Earth with historic splashdown off Florida coast

Beauty and Lifestyle Influencer Laura Lee Shares Her Relaxing Nighttime Rituals

Who were the Knights Templar?

Why don't we breathe equally out of both nostrils?

The Genius Products That Will Help You Change Up Your Routine for the Better

Yoga for back pain: What you need to know

Dyson Purifier Cool review

How to breathe while running

How to get fit

Ötzi the Iceman: The famous frozen mummy

Firefighters race to save the world’s largest tree as wildfires rage

Explorers add 8 miles to world's longest known cave system

Nearly 900 years ago, astronomers spotted a strange, bright light in the sky. We finally know what caused it.

Mass grave of slaughtered Crusaders discovered in Lebanon

Baby elephants frolicked in an ancient 'nursery,' fossil footprints show

'Flying dragon' fossil found preserved inside a rock in the Chilean desert

New gravitational wave detector picks up possible signal from the beginning of time

Bizarre tail on little dinosaur-age bird was literally a drag

Horse tranquilizer crops up in overdose deaths around US

These 13 Supplements Have Age-Reversing Effects

9 allergy season symptoms

SpaceX launches four civilians into orbit on historic Inspiration4 flight

Is running good for you?

Slaughter of more than 1,400 dolphins in the Faroe Islands sparks condemnation worldwide

Does running build muscle?

Needle-nose extinct giant penguin from New Zealand is a newfound species

Human remains found inside 500-pound alligator. How common are alligator attacks?

Read an excerpt from 'Pump: A Natural History of the Heart'

Rare Bronze Age coffin uncovered on UK golf course

A 10-billion-year-old supernova will soon replay before our eyes, new dark matter study predicts

It's a Fact: Our Editors and Readers Love This Trusted Activewear Brand

Do air purifiers help with allergies?

10 stretches to do every day

Chagas disease: Cause, symptoms, treatment and prevention

Giant squid: The real-life ocean Kraken

Mysterious stone balls found in Neolithic tomb on remote Scottish island

Giant ice sheet towers over Scottish city like the Wall in 'Game of Thrones' in stunning video reconstruction

I Ate the Same Food Every Week—Then I Found This Premium Meal-Kit Service

Why do primates carry around dead infants?

Distant 'Requiem' supernova will be visible again in 2037, astronomers predict

Chinese astronauts send back stunning images of Earth from Tianhe space station (photos)

Parade of life-size camel carvings in northern Arabia date to the Stone Age

The 8 Best All-Natural Lubes for People With Vaginas

12 Latin-Owned Wellness Brands You Should Know About

99 million-year-old spider mummies reveal moms cared for teeny spiderlings

Delta-8 marijuana products can be dangerous, health officials warn

How 'Spider-Man' and 'Pac-Man' immune cells team up to fight invasive bacteria

Deadly Nipah virus kills boy in India, prompts worries over outbreak

Otherworldly 'time crystal' made inside Google quantum computer could change physics forever

1st 'atom tornado' created from swirling vortex of helium atoms

If you 'heart' trivia about the heart, enter to win a copy of 'Pump'

Travel through galaxies and the dark matter web in this stunning universe simulation

Tick transforms into a glowing alien from a sci-fi nightmare in trippy photo

Bizarre pig-faced shark found dead in the Mediterranean Sea. Is it real?

13 Alcohol-Free Mouthwashes Your Gums Will Thank You For

Lumpy tumor shown on facial reconstruction of Neanderthal who lived on 'drowned land'

Facts about tardigrades

Do indoor plants purify air?

The weirdest creatures to wash ashore

What is the oldest-known archaeological site in the world?

Cosmic objects with strange orbits discovered beyond Neptune

Does the moon rotate?

15 Actually Cool Pet Items I Wish I Knew About Before I Became a Dog Mom

Why did the Maya civilization collapse?

The 'megacomet' Bernardinelli-Bernstein is the find of a decade. Here's the discovery explained.

Archivist's vintage 'Images of Apollo' photo prints land on auction

Our Milky Way galaxy isn't very well mixed, study suggests

10 Foods to Eat for a Happier Period—and 6 to Avoid

11 Morning Workouts to Try to Make Your Day Better

Perseverance rover collects 2nd Mars sample (photos)

In Hurricane Ida's wake, satellite images show oil slicks in Gulf of Mexico

Why don't poisonous animals die from their own toxins?

Milkweed butterflies tear open caterpillars and drink them alive

These Stretches Can Make Your Body Feel So Much Better

What's the rarest blood type?

Pfizer & BioNTech will soon seek approval for COVID-19 vaccine in young children

Elusive angel shark shows off its ninja ambush skills in rare underwater footage

The world’s fastest animals

Super-precise clock tech wins $3 million physics Breakthrough Prize

An 18-foot-long sea monster ruled the ancient ocean that once covered Kansas

Do humidifiers help with allergies?

Spectacular valleys and cliffs hidden beneath the North Sea

Strict caps must be set on fossil fuel extraction to meet climate goals, study finds

Air purifiers vs ionizers: what’s the difference?

Is Sweating Actually Good for Your Skin? We Asked a Dermatologist

Tyrannosaurs bit each other's faces in dino fight clubs

Smoke sets off alarms on the International Space Station

Air purifiers vs humidifiers: What's the difference?

COVID-19 test caused man's 9-month-long brain fluid leak

How do air purifiers work?

Weird 'dog bone' asteroid could be a pile of cosmic rubble

2 scientists win $3 million 'Breakthrough Prize' for mRNA tech behind COVID-19 vaccines

How do cats get their stripes?

Stunning colorized footage provides a glimpse of the last known Tasmanian tiger

The world turns sideways in trippy, glowing Earth photo from the International Space Station

Is running good for weight loss?

Does running burn fat?

7 Foods to Avoid If You're Dealing with Acne—And What to Eat Instead

Is Stevia Bad for You? A Nutritionist Gives Us the Honest Truth

8 Common Things That Can Change Your Breast Size

Strange, repeating radio signal near the center of the Milky Way has scientists stumped

Cheetahs battle raging river in stunning photo. Did they survive?

Helmet-headed Cambrian sea monster sucked up prey like a Roomba

Gigantic 'shark-toothed' dinosaur discovered in Uzbekistan

1st sign of elusive 'triangle singularity' shows particles swapping identities in mid-flight

These 12 Things Transformed Me Into a Bath Person

This Australian bird’s cry sounds just like a human baby

What is the Paris Agreement?

Farming brought burst of extreme violence to Atacama Desert, ancient mummies reveal

Dark regions of the genome may drive the evolution of new species

Antibiotics may raise colon cancer risk, massive study suggests

The 20 Best Sexual Wellness Products to Make Your Sex Life Better

Satellite images show extreme flooding in New Jersey in the aftermath of Hurricane Ida

Dense 'hot spots' on a young star reveal what Earth's sun may have looked in its infancy

Why is the color blue so rare in nature?

An 'Internet apocalypse' could ride to Earth with the next solar storm, new research warns

These Are the Best Period-Tracker Apps, Hands Down

Why is alcohol used to preserve things?

The 20 Healthiest Vegetables You Can Eat, According to Top Nutritionists

Why do we grind our teeth?

9 Yoga Poses That Just Might Cure Your Headaches

Who will buy 'Big John,' the biggest triceratops ever found?

What are antioxidants?

Dead stars crashing into live stars may trigger a new type of supernova

'Red light' warning flashed during Richard Branson's historic spaceflight, Virgin Galactic insiders say

Artistic giant Michelangelo was actually quite short

Alien-like cookiecutter sharks terrorize animals of all sizes

Got a cool pet? Enter to win this book on their prehistoric counterparts.

8-foot-tall pagan idol unearthed in Irish bog

World's largest rodents are taking over a fancy gated community in Argentina

Health officials quietly moved the date of the 1st US COVID-19 death to January 2020

9 Things You Need to Know About Liquid Vitamins Before Taking Them

'Perfect' Mars rock sample drilled from the Red Planet in historic mission

Mysterious object called 'The Accident' has been careening through the Milky Way for 10 billion years

'What the heck is that?' Florida angler catches 'tortilla fish.'

World's largest Martian meteorite goes on display

Byzantine church dedicated to unknown martyr unearthed in Israel

China wants to build a mega spaceship that’s nearly a mile long

A quarter of sunlike stars eat their own planets, according to new research

California's Caldor Fire seen from space in harrowing satellite images (gallery)

Scientists discover on-off switch for bacteria that breathe electricity

Do wolves wag their tails?

New 'mu' coronavirus variant could escape vaccine-induced immunity, WHO says

21 Leggings to Refresh Your Workout Wardrobe

Huge, gold-standard study shows unequivocally that surgical masks work to reduce coronavirus spread

Is a 'fetal heartbeat' really a heartbeat at 6 weeks?

Why tiny tardigrades walk like insects 500,000 times their size

Amazing Hubble telescope photo shows space 'sword' piercing huge celestial 'heart'

Watch a supermassive black hole feast in mesmerizing new simulation (video)

Is dark matter made of 'Fermi balls' forged in the Big Bang?

Medieval Russians hid silver hoard before Mongol invasion

Flu season will be bad this year, research predicts

7 megalodon shark facts that will blow your mind