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A Union Pacific locomotive makes its way through Cajon Pass in Southern California. The “Building America” slogan is not just puffery: Union Pacific is the nation’s largest railroad, and was also one of the original companies responsible for constructing the transcontinental railroad in the 1860s.

These Photographs Capture the Indescribable Glory of Trains

America’s fascination with trains is fast-tracked in this study of passing freight

Roughly two million years old, this tool, known as the Kanjera stone, was part of a new Stone Age technology that helped make better-fed, smarter hominins.  

This Is the Oldest Human-Made Object in the Smithsonian Collections

Roughly two million years ago, simple items like the Kanjera tool sparked a revolution in the way humans lived

Panama’s National Authority for the Environment (Autoridad Nacional del Ambiente, ANAM) manages Coiba National Park, which is accessible via permit. Guests can book overnight lodgings in several air-conditioned cabins next to the ANAM ranger station.

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How a Former Penal Colony in Panama Became a Biodiversity Hotspot

For decades, Coiba Island was inhabited by prisoners. Now, scientists and adventurous tourists visit a national park teeming with wildlife

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When Coal First Arrived, Americans Said ‘No Thanks’

Back in the 19th century, coal was the nation’s newfangled fuel source—and it faced the same resistance as wind and solar today

Mujer con gallo (Woman With Rooster), 1941.

What Made Mariano Rodríguez’ Art Uniquely Cuban

A mid-century modernist and native son elevated ordinary Cuban life

One reader wonders: Since purple dye was scarce, why didn’t people just combine blue and red?

Why Was Purple the Color of Royalty? And More Questions From Our Readers

You’ve got questions. We’ve got experts.

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Untold Stories of American History

The Southbound Underground Railroad Brought Thousands of Enslaved Americans to Mexico

Rather than head north, many of those in bondage made a different treacherous journey in a bold quest for freedom that historians are now unearthing

An 1897 painting by Charles R. Knight depicting two dinosaurs called “Laelaps” in an energetic fight, suggesting they may have been warm-blooded.

Paleontologists Are Still Puzzling Over Why Dinosaurs Ran Hot

New evidence reveals details about the physiology of animals that have been extinct for over 66 million years

The men of the 23rd Headquarters Special Troops created elaborate illusions featuring inflatable tanks, jeeps and artillery.

Untold Stories of American History

How the Ghost Army of WWII Used Art to Deceive the Nazis

Unsung for decades, the U.S. Army’s 23rd Headquarters Special Troops drew on visual, sonic and radio deception to misdirect the Germans

Pages from Plastic Surgery of the Face by Harold Gillies

Inside a Trailblazing Surgeon’s Quest to Reconstruct WWI Soldiers’ Disfigured Faces

A new book profiles Harold Gillies, whose efforts to restore wounded warriors’ visages laid the groundwork for modern plastic surgery

The new Smithsonian show examines the foundational contributions of Latinos in shaping the history and culture of the United States. 

You Can Now Preview the Upcoming Latino Museum

New exhibition “¡Presente!” aims to show how Latinos shaped American history

Researchers at Northwestern University created an implantable device that attaches to a nerve to deliver pain relief.

Innovation for Good

This Dissolvable Implant Could Revolutionize Pain Management

After some success on rats, researchers are hopeful this device could provide humans a more targeted and less addictive alternative to opioids

In their dissent, the court's three liberal judges wrote that their fellow justices had stripped the EPA of “the power to respond to the most pressing environmental challenge of our time.”

History of Now

How the Clean Air Act Came to Be

A new Supreme Court ruling curbs the EPA’s ability to regulate carbon pollution under the 1970 legislation

The yellow fever mosquito, Aedes aegypti, spreads dengue fever, Zika, chikungunya and other viruses that infect humans.

Dengue Fever and Zika Virus Make Humans More Attractive to Mosquitoes

Scientists conducted human and mouse studies to find the skin bacteria responsible for the draw

Communist revolutionary Rosa Luxemburg speaking at a conference in Stuttgart, Germany, in 1907

History of Now

The 20th-Century History of Anti-Semitic Attacks on Jewish Politicians

Russian rhetoric against Ukrainian president Volodymyr Zelenskyy echoes the language directed toward Jewish leaders in post-WWI Europe

More than 10,000 mental health apps are available, according to one estimate. In order to pick the most reliable ones, researchers say you should consider their privacy policies, effectiveness, and costs.

The Future of Mental Health

Can a Mental Health App Help You Deal With Anxiety?

Experts say the aids can be a first step to meaningful treatment if you choose an app based on three criteria

Gilliam, 88, died June 25 in his studio, just miles from the Hirshhorn Museum and Sculpture Garden, which recently opened a captivating new show, “Sam Gilliam: Full Circle.”

Abstractionist Sam Gilliam Dies at 88, Hirshhorn Hosts His Final Show

The beloved Washington, D.C. artist went full circle with a bold new series of round paintings

The single-engine, single-seat Turner RT-14 Meteor is the "epitome of what a 1930s air racer in the United States would be: big engine, big propeller, small profile,” says the museum's Jeremy Kinney.

The Record-Shattering Airplane Behind a Dashing Pilot’s Meteoric Rise to Fame

Roscoe Turner’s air racer takes center stage this fall when newly renovated galleries open at the National Air and Space Museum

Glowing green waters surrounded a boat in the Arabian Sea.

What Causes Swaths of the Ocean to Glow a Magnificent Milky Green?

A sailor who witnessed the rare phenomenon in person and a scientist who saw it from the sky team up to learn about the ghostly light

A skeleton of the giant Triassic ichthyosaur Shonisaurus popularis hangs in the Nevada State Museum.

Whale-Sized Marine Reptiles Once Ruled the Seas

Paleontologists are beginning to learn how and why ichthyosaurs evolved into giants

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