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 2014-15 flu vaccine is here, but the CDC warns that it's not as effective as hoped.

A Universal Flu Vaccine May Be On the Horizon

Choosing the viral targets for the seasonal flu vaccine is a gamble. Sometimes, like this year, the flu wins

A multihued aurora ripples across the night sky over Tromsø, Norway, on January 19. Auroras happen when high-energy particles from the sun slam into Earth's atmosphere, exciting gas molecules in the air and causing them to emit light. The colors seen depend on the type of molecules involved and the altitude at which the most interactions are happening. Green is the most common shade for auroras and is produced by oxygen molecules at relatively low altitudes—between 62 and 186 miles.

Best Space Photos of the Week

These Celestial Highlights Include Flowing Auroras and a Cracked Comet

Catch up on the week’s best space images, from a cyclone’s glowing eye to a surreal Martian vista

The western tarsier, a rare primate species, has lost large amounts of its Borneo habitat to logging. More of that habitat is likely to disappear because of climate change.

Borneo’s Mammals Face a Deadly Mix of Logging and Climate Change

But adding small amounts of land to already protected areas could help save the island’s biodiversity

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

Tony the Tiger, a 550-pound Siberian-Bengal mix, lives in a cage at a Louisiana truck stop.

America Has a Tiger Problem And No One’s Sure How to Solve It

No one even knows how many of the big cats are in the United States

Can the Siberian Tiger Make a Comeback?

In Russia’s Far East, an orphaned female tiger is the test case in an experimental effort to save one of the most endangered animals on earth

The International Space Station Will Soon Be Able to Measure Forest Density Using Lasers

Strengthening the planet’s forests is one critical way to combat climate change

The Wrists of Birds Reveal Evolution Undoing Itself

Contrary to earlier claims, a new study shows that evolution may be reversible

A diverse array of trilobites ruled the seas for almost 300 million years, until they vanished at the end of the Permian period.

Vinegar-Like Acid Rain May Have Fallen During Earth’s Worst Extinction

Vanilla-flavored rocks hint at a planet scoured by intense acid rain during the Great Dying 252 million years ago

A closeup of a Herculaneum papyrus scroll used in an international scanning project.

Ancient Scrolls Blackened by Vesuvius Are Readable at Last

X-ray scans can just tease out letters on the warped documents from a library at Herculaneum

Ten years ago this week, the Huygens probe gave scientists a first look at the icy surface beneath the haze of Saturn's moon Titan.

Best Space Photos of the Week

Best Space Photos of the Week: From Solar Flares to Saturn’s Moons

A spitting sun, a well-loved lake and a happy accident on Mars star in this week’s best space images

Social media may be more relaxing than anticipated.

Social Media Is Not Making You a Ball of Stress

But perhaps unsurprisingly, Facebook and Twitter can cause stress to spread when bad things happen to friends and family

The lavish displays of the Gold Souk in Dubai are a long way from deforested areas of South America, but a new study connects the two worlds.

Lust for Gold Is Consuming Precious South American Forests

Satellite images show that while the scale of deforestation is small, it is bleeding into protected areas

Researchers exhumed the mummy of Cangrande della Scala in 2004 to perform a modern autopsy on the famous Italian autocrat.

Poison Hath Been This Italian Mummy’s Untimely End

A lethal helping of foxglove seems to have triggered the downfall of a warlord of Verona

This multicolored lily pad is actually a bloom of the iron-based mineral hematite in Brazilian quartz.

Art Meets Science

Surreal Photos Reveal the Otherworldly Insides of Gemstones

If you thought gems were beautiful to the naked eye, take a look at them under a microscope

Hubble snapped this incredibly detailed view of the "Pillars of Creation" to help mark its 25th anniversary.

Top Space Pictures of the Week, From a Hubble Icon to Hungry Black Holes

Ghostly pillars, a dark nebula and a galaxy herd starred in some of the best image-driven stories released at a recent astronomy meeting

An Asian tiger mosquito in action.

New Research

Could GM Mosquitoes Pave the Way for a Tropical Virus to Spread?

Modified insects designed to stop dengue fever could make it easier for another disease-carrying species to take root

To reduce carbon dioxide emissions, the world would need to leave some 80 percent of current coal reserves in the ground, according to a new study.

Anthropocene

To Meet Global Warming Targets, Leave Fuels In the Ground

Hefty percentages of fossil fuels need to remain untapped to curtail the rising global temperature

A handful of promising drug candidates?

A New Antibiotic Found in Dirt Can Kill Drug-Resistant Bacteria

Tests in mice show that the new drug works against numerous nasty diseases and should stay viable for decades

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