Theresa Machemer

Theresa Machemer is a freelance writer based in Washington DC. Her work has also appeared in National Geographic and SciShow. Website: tkmach.com

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Watch This Deep-Sea Sponge Sneeze in Slow Motion

The glass sponge can take up to a month to finish a sneeze

An 18th-century Spanish coin next to a modern American quarter

Florida Treasure Hunters Unearth Trove of Silver Coins From 18th-Century Shipwreck

The find stems from a fleet of 11 Spanish ships that sank off the coast of Florida in 1715

This Cranwell's frog fluoresces green in blue light

In Blue Light, Most Amphibians Have a Neon-Green Glow

Researchers at St. Cloud State University in Minnesota shed light on frog and salamander bioluminescence

Two winners split the Plougastel-Daoulas contest's grand prize of €2,000.

Has This Boulder's Mysterious, Centuries-Old Inscription Finally Been Deciphered?

Two newly publicized translations suggest the message is a memorial to a man who died in the 1700s

Stone tools found at the Dhaba site from the same time as the Toba volcanic super-eruption.

Ancient Humans May Have Survived Supervolcano Eruption Nearly 74,000 Years Ago

Stone tools in north-central India suggest that ancient residents adapted to a world cooled by volcanic ash

Not one, but two rare cloud features hovered side by side, lit by the sunrise, on Monday morning over Mount Washington in New Hampshire.

Two Rare Cloud Features Appear Over New Hampshire’s Mount Washington

The formations are "sculpted" by differences in air pressure and usually last less than a minute

Tourists wait to see Leonardo da Vinci's Mona Lisa.

More Than One Million People Saw the Louvre's Blockbuster Leonardo da Vinci Exhibition

The record-breaking show attracted almost double the number of visitors as the Paris museum's 2018 Delacroix retrospective

A gray whale "spyhopping" off the coast of Alaska. Gray whales migrate over 12,000 miles along North America's west coast.

How Storms on the Sun Interfere With Whale Migration

The new research gives weight to the hypothesis that gray whales use Earth’s magnetic field to navigate

Gardens alongside the Juliette Gordon Low Birthplace became archaeological sites where Girl Scouts discovered handmade nails and a shard of pottery.

Girl Scouts Join Archaeological Dig at Birthplace of Organization's Founder

The 200-year-old house, where Juliette Gordon Low was born in 1860, is undergoing renovations to increase its accessibility

A reconstruction image showing the scale and decorated interior of Bishop Bek’s 14th-century chapel at Auckland Castle

Archaeologists Identify Site of Long-Lost Chapel Razed During English Civil War

The "sumptuously constructed" 14th-century chapel was roughly the same size as Sainte-Chapelle in Paris

Icebergs breaking off of Pine Island Glacier into Pine Island Bay, where researchers found an uncharted island now named Sif.

Melting Glaciers Reveal a New Island in Antarctica

Earlier this month, Antarctica experienced its third major melt event of the summer, including record high temperatures

A coral-covered propeller of a U.S. SBD-5 Dauntless dive bomber stands on the sea floor in Truk Lagoon.

Three U.S. Planes Lost During World War II Found in Pacific Lagoon

Project Recover, a nonprofit dedicated to locating MIA service members, identified the planes' location

Shawn Walker, Neighbor at 124 W 117th St, Harlem, New York, ca. 1970-1979

Library of Congress Acquires 100,000 Images by Harlem Photographer Shawn Walker

The African American photographer was a founding member of the Kamoinge Workshop, an art collective launched during the 1960s

View of Takarkori shelter from the west.

Fossilized Fish Bones in the Sahara Desert Show How Diets Changed With the Climate

Thousands of years ago, hunter-gatherers in the “green Sahara” ate mostly catfish and tilapia

Pompeii's House of Lovers, first uncovered in 1933, was severely damaged in a 1980 earthquake.

Pompeii's House of Lovers Reopens to the Public After 40 Years

The building, one of three newly restored painted houses, is named for a Latin inscription that reads, “Lovers lead, like bees, a life as sweet as honey”

An installation view of the "Fantastic Women: Surreal Worlds From Meret Oppenheim to Frida Kahlo" exhibition

Spotlighting the Forgotten Women of the Surrealist Movement

A new show reveals how Frida Kahlo, Meret Oppenheim and other women artists probed questions of femininity, autonomy and politics

Olms, also called "baby dragons" and "human fish," are blind, foot-long salamanders native to European caves.

A Cave-Dwelling Salamander Didn't Move for Seven Years

The blind, eel-like amphibians called olms live deep in European caves and can go years without food

The Chiba cliff section along the Yoro River in the city of Ichihara shows traces of a reversal in the Earth's magnetic field.

The 'Chibanian Age' Is the First Geologic Period Named After a Site in Japan

The period is named for Japan’s Chiba prefecture, where a cliff shows evidence of the most recent reversal of Earth’s magnetic field

The tapestries depict scenes from the lives of St. Paul and St. Peter.

For One Week Only, Raphael's Tapestries Return to the Sistine Chapel

This is the first time all 12 of the Renaissance creations have been united in their original home since the 16th century

40 million people rely on the Colorado River for water, but its flow is falling by more than 9 percent with every 1.8 degrees Fahrenheit rise in temperature.

The Colorado River Is Shrinking as Temperatures Rise

River flow could drop by 19 to 31 percent if carbon emissions continues at their current pace

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