Adrenaline crystals (polarized light micrographs). Adrenaline, also called epinephrine, is normally present in blood in small quantities. It is a hormone produced in the adrenal glands above the kidneys. The glands are controlled by the hypothalamus, the part of the brain responsible for instinct and emotion. In times of stress, more adrenaline is secreted into the bloodstream. It widens the airways of the lungs and constricts small blood vessels. This makes the muscles work harder and produces a "fight or flight" response. Adrenaline used as a drug expands the bronchioles in acute asthma attacks and stimulates the heart in cases of anaphylactic shock.

Art Meets Science

Blood Clots, Liver Cells and Bird Flu Are Surprisingly Beautiful Under a Microscope

The brightly-colored micrographs and scans in a new book, Science is Beautiful, answer big questions about the human body

A chart of chocolate future prices since Valentine's Day, 2014

The World of Chocolate

The Economics of Chocolate

Before becoming a kiss, bar, or hot drink, cocoa gets shipped, stashed, smashed, and, most critically for producers and consumers alike, commodified

Noma, one of the best restaurants in the world, and a location some chefs would travel any distance to visit.

Ten Restaurants the Best Chefs Say Are Worth Traveling For

These establishments are always worth the trip, according to some of the top chefs in the world

The mouthwatering nature of chocolate is one constant no matter where you go.

Switzerland

Chocolate Destinations Around the World to Drool Over

These five places from Belgium to Hong Kong offer their own enticing takes on the confection

You can thank these Theobroma cacao flowers for your brownie sundae.

The World of Chocolate

You Wouldn’t Have Chocolate Without Invisible Flies and Extreme Yeast

It takes a wild and temperamental menagerie to bring the beloved candy to store shelves. Bon appétit!

Chocolate beer spans a wide spectrum of flavors and varieties.

The World of Chocolate

A Taste Test to Find the Best Chocolate Beers

Perfect for a cold, winter day – or as an alternative to red wine on Valentine’s Day – we took measure of these stouts, ales and lagers

Lick and Lather, 1993, two self-portrait busts: one chocolate and one soap is currently on view at the Hirshhorn Museum and Sculpture Garden.

The World of Chocolate

The Art of Chocolate (and Soap)

Conservators went on a scientific journey to discover the best ways to preserve artist Janine Antoni’s landmark “Lick and Lather”

Round Table

What is the Most Important Innovation in the History of Rock ‘n’ Roll?

Musicians, historians and critics tell us what they consider to be the greatest game changers for the industry

Eddie Van Halen, 1985

The Electric Guitar’s Long (And Louder), Strange Trip

From its gentle 16th-century acoustic origins to the souped-up ‘Frankenstein,’ a Smithsonian scholar strums the historic chords of the guitar

The World of Chocolate

The World of Chocolate

Both within the Smithsonian and in the broader world, the story of chocolate has many fascinating morsels

Exterior of Fallingwater by Frank Lloyd Wright.

Frank Lloyd Wright Buildings Nominated for Unesco World Heritage Status

It’s the first time the United States has nominated works of modern architecture

Amager Resource Center, Copenhagen, Denmark. Under construction. This power plant, which turns household waste into electricity, is the cleanest in the world. "Normally, you want to be as far away from the power plant as possible because of the toxins, but in this case you literally have fresh mountain air on the roof of the building. Since we have snow in Denmark, but we don't have hills, we made the roof into a big ski slope," Ingels explains. The chimney puffs a giant steam ring each time a ton of carbon dioxide is emitted.

Designing Buildings For Hot Climates, Cold Ones and Everything in Between

A decade’s worth of sustainable projects by Danish architect Bjarke Ingels and his firm, BIG, are now on display at the National Building Museum

In some parts of the country, this is what duck sauce looks like. In others, not so much.

Ask Smithsonian

What Exactly Is Duck Sauce?

Trying to get to the bottom of this Chinese food mystery sends our writer on a wild goose chase

In the garden, Levisticum is a tall plant with dark leaves and greenish-yellow flowers. Under a microscope, however, it can morph into a cellular rainbow. This image was made using polarized light to enhance contrast. Waves in polarized light share an orientation, and special filters can block out any unpolarized waves and make the fine details easier to see.

New Exhibit Showcases the Power of Light in Our Everyday Lives

The open-source show “LIGHT: Beyond the Bulb” crosses disciplines to show the many ways photonics has improved our lives

Choose among these three cultural icons for the comedian who will be featured at the National Portrait Gallery.

Sponsor: National Portrait Gallery

Which of These Comedians Should the Portrait Gallery Put on Display?

This is no laughing matter for the Smithsonian museum

The 1354 painting, Dwelling in Seclusion in the Summer Mountains, by the artist Wang Meng is now on view at the Freer Gallery through May 31.

Why this 14th-Century Chinese Artist Is Having a Rebirth

The rare works of Wang Meng, an artist with a brilliance for brushstrokes, bring millions at auction

David Douglas Duncan, American. Marine Capt. Ike Fenton, Naktong River Permieter, No-Name Ridge, South Korea.

Getting up Close and Personal with American Soldiers

A new photography exhibit takes a multi-decade look

An aerial view shows the location of the culture and university district, a 4.5-acre triangular site, near the London Aquatics Centre, the former Olympic Stadium and the ArcelorMittal Orbit sculpture and observation tower.

The Smithsonian May Go for the Gold, Opening a Venue at London’s Olympic Grounds

The Smithsonian Regents give museum officials the thumbs-up to explore opening a new gallery in London and the mayor there says, “Welcome to our city”

No snowman is perfect, but a bit of physics know-how can help in the construction process.

Ask Smithsonian

Do You Want To Build a Snowman? Physics Can Help

Here’s what you need to know about the science of constructing your very own Olaf

The underside of this recently flipped iceberg is glassy and free of debris.

An Iceberg Flipped Over, and Its Underside Is Breathtaking

On vacation in Antarctica, filmmaker and photographer Alex Cornell captured an unusual sight

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