A view of an over 400-year-old tree on Barro Colorodo Island, on November 23, 2015

Why Are Giant, Ancient Tropical Trees Dying?

Scientists from an international project are racing to figure out what kills these anchors of their ecosystems—before it’s too late to save them

Apollo 11 astronaut Buzz Aldrin deploys a device to detect moonquakes during the first moonwalk.

Thousands of Moonquakes Rocked the Apollo Landing Sites in Less Than a Decade

A new study found 22,000 previously unidentified lunar seismic events recorded between 1969 and 1977

A hazel-eyed tiger glares through a tangled web of branches in Satpura Tiger Reserve.

Feast on 15 Ferocious Tiger Photos From the Smithsonian Photo Contest

This majestic big cat is one of the world’s most recognizable

A jar containing Ascaris, a parasitic worm that affects over one billion people worldwide

Parasites Are Everywhere. Why Do So Few Researchers Study Them?

Aging parasitologists are working hard to inspire more students to enter the field

Rainforests, like this one in Ecuador, only appeared after the mass extinction that ended the Age of Dinosaurs.

No, Dinosaurs Did Not Trudge Through Thick Rainforests

The first jungles dense with flowering plants only formed after an asteroid impact wiped out the giant creatures

A rhesus macaque on Cayo Santiago, which is less than a mile east of Puerto Rico. Rhesus macaques spend upwards of 20 percent of their time engaged in cooperative behaviors like grooming.

How Do Animals Change Their Social Habits as They Age?

In patterns that may sound familiar, long-term studies reveal what elderly deer, sheep and macaques are up to in their twilight years

Technological advances have changed Olympic sports—including fencing, sprinting, distance running and pole vaulting.

From Sleek Swimsuits to Specialized Running Shoes, These Five Innovations Transformed the Olympics

Technology has advanced sports including fencing and pole vaulting

Established in 2019, Indiana Dunes National Park represents one of the most understated successes of 20th-century conservation—and the battle is far from over today.

Inside the Fight to Save the Indiana Dunes, One of America’s Most Vulnerable National Parks

Caught between steel mills, suburbs and a hard place, the 15,000-acre site is a fantasia of biodiversity—and a case study for hard-fought conservation

None

There's More to That

How to Sweat Like an Olympian

This summer, don’t be embarrassed by those pit stains or your drenched workout clothes. Our expert on the science of sweat says perspiration is what makes humans faster, higher and stronger

A thin slice of the ancient rocks collected from Gakkel Ridge near the North Pole, photographed under a microscope and seen under cross-polarized light

Geologists Uncover Remnants of Earth’s Mantle That Have Lasted Over 2.5 Billion Years

New research suggests that a discrepancy in rocks shows they endured extreme heat, and reveals more about an ancient part of our planet’s history

The JOIDES Resolution in 2012 off the coast of Costa Rica, on an expedition to understand how earthquakes form

What Will Happen If This Iconic Research Vessel Stops Drilling in the Deep Sea?

After a career marked by major discoveries, the JOIDES Resolution is likely on its last official mission to retrieve rock cores from the ocean floor

A lesser flamingo feeds at Lake Bogoria, in Kenya.

How Will Climate Change Hurt Lesser Flamingos?

Their food supply in East African lakes could collapse as rains increase

The remains of whales that sink to the ocean floor become biological oases. Since 1977, scientists had only identified about 50 such whale falls across the world’s oceans, but a recent effort uncovered a startling density of them off the coast of Los Angeles.

Why Have So Many Whale Remains Been Found on the Ocean Floor Near Los Angeles?

Scientists have discovered more whale falls there than in the rest of the world combined

Some historians have suggested the giant turtle reported in 1948 was an alligator snapping turtle, pictured here. Other experts disagree with this theory.

Could Citizens of This Indiana Town Have Seen a 500-Pound Turtle?

Two men said they saw such an animal, dubbed the Beast of Busco, in 1948

A light painting made in Delhi, India, in December 2016 shows high air pollution levels a month after an extreme air quality event.

These Alluring Images Capture the Threats of Air Pollution Around the World

Researchers combined long-exposure photography with pollution sensor data to create representations of pollution in India, the United Kingdom and Ethiopia

With their distinct shape, hammerheads are among the most recognizable sharks.

20 Shark Week Photos That Will Terrify and Delight You This Summer

In a collection pulled from the Smithsonian Magazine Photo Contest, catch a wave with these predators of the sea

Asteroid impacts and volcanism have led to mass extinctions on our planet.

Has Life on Earth Survived More Than Five Mass Extinctions?

Scientists aren’t just arguing whether humans are causing a sixth mass extinction event now, but whether many more occurred in the past

Estimated at 5,000 to 7,000 individuals, the koala population is the largest and healthiest in the state of Victoria, and second only in size to that of Kangaroo Island in the whole country.

This Island Is Inhabited by More Koalas Than Humans

Australia’s French Island is home to one of the country’s largest and healthiest koala populations, but it’s not impervious to the species’ struggles

None

There's More to That

The Wild Story of What Happened to Pablo Escobar’s Hungry, Hungry Hippos

Ever since the demise of the infamous drug kingpin, his pet hippos have flourished, wreaking havoc on the ecosystem and terrorizing local communities

For some animals, romance goes more smoothly when it comes with gifts.

When It Comes to Romantic Gift-Giving, Humans Aren’t Alone. Snails, Birds and Flies All Woo Each Other With Presents

Throughout the animal kingdom, sweethearts bestow offerings with their amorous advances

Page 17 of 453