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Around Saturn’s north pole, a jet stream follows a six-sided path roughly 30,000 kilometres across. Clouds and vortices move through the region while the immense wave keeps its recognizable geometry.

Beneath the frozen surface of Saturn’s moon Enceladus lies a global ocean. Material from that ocean escapes through fissures near the south pole and carries chemical clues into space.

Arrays of corner-cube reflectors left on the Moon return a small fraction of laser light toward its source. Timing those returning photons lets observatories repeatedly measure the Earth–Moon distance.

Seeds carried around the Moon aboard Apollo 14 were germinated on Earth and distributed as living memorials to the mission, many during the United States bicentennial.

This desert gymnosperm keeps the same two permanent leaves throughout its adult life. New tissue emerges at their bases while the exposed ends split into weathered ribbons.

In 1997, hydrophones thousands of kilometers apart recorded a powerful low-frequency sound in the southern Pacific. Later observations tied the once-mysterious signal to cracking Antarctic ice.

Across several unrelated deep-sea lineages, densely arranged pigment structures absorb nearly every photon that reaches the skin, hiding the animal’s shape from bioluminescent searchlights.

Recovered from a shipwreck off Antikythera, this corroded Greek mechanism joined calendars and astronomical cycles in a hand-operated system of bronze gears.

Yale’s Beinecke Library holds an illustrated manuscript written in an unidentified script. Its author and meaning remain debated.

During the First World War, ships crossed the sea in bold geometric paint schemes designed to disrupt an attacker’s judgment of their course, speed, and shape.

On Fajada Butte in Chaco Canyon, shafts of seasonal sunlight moved across carved spirals behind three upright slabs. The alignment is believed to have marked solstices and equinoxes.

More than 100 metres inside an Arctic mountain, genebanks store duplicate crop seeds as insurance against damage or loss in their working collections.

Rocks cross Death Valley’s Racetrack Playa and score long trails into its surface. Researchers finally watched them move when shallow water, thin ice, sunlight, and wind aligned.

In 1958, an earthquake sent rock into a narrow Alaskan inlet. The resulting wave stripped vegetation from a slope more than 500 metres above the water.

At Great Sand Dunes in Colorado, an avalanche of dry sand can produce a sustained low hum or boom as countless grains move together down a steep slip face.

Inside a West Texas mountain, an immense mechanical clock is being assembled to keep time for 10,000 years. Sunlight corrects its long-term drift, while visitors supply energy for displays and chimes.

Installed at Oxford in 1840, two dry-pile batteries still drive a suspended metal sphere back and forth between a pair of bells at roughly two swings per second.

More than 2,500 pigment samples at Harvard preserve the physical ingredients of color for conservation research, teaching, and the study of how artworks were made.

In rural Japan, worn garments and household cloths were patched with saved fabric and reinforced by running stitches. The resulting layers preserve a material record of use, scarcity, and care.

Édouard-Léon Scott de Martinville built a machine that traced airborne sound. A voice recorded in 1860 remained silent until researchers converted its paper waveform into audio in 2008.

Inside Virginia’s Luray Caverns, an organ console controls rubber-tipped mallets that strike stalactites spread across the cave, turning natural stone formations into sounding bars.

At the University of Queensland, pitch that looks and feels solid has been flowing through a glass funnel since 1930. Only nine drops have completed the journey.

Inside a former Federal Reserve continuity bunker in Virginia, the Library of Congress preserves millions of films, broadcasts, recordings, and the machinery needed to play them.

NASA's image library records Wernher von Braun.

Aimé-Jules Dalou modeled Bacchus awakening the abandoned Ariadne, with a faun offering grapes beside them. This plaster group appeared at the Paris Salon in 1892 and became the model for a marble version.

The Cleveland Museum of Art catalogs Mirror as metalwork (Korea, Goryeo dynasty (918–1392) · 918–1392).

The Smithsonian catalogs Gas mask with filter canister worn at demonstrations in Ferguson, Missouri as gas masks in its African American records.

A free online textbook in Languages: Salón de Clase: Intermediate Spanish for Education Professionals.

Goodbye, Mrs. Ant, an archival ephemeral film in the Prelinger Archives collection.

Freedom to Learn, an archival ephemeral film in the Prelinger Archives collection.

American Engineer (Part I), an archival ephemeral film in the Prelinger Archives collection.

[Amateur film: "Frisco Fair / Pacific Northwest"], an archival ephemeral film in the Prelinger Archives collection.

Mental Hospital, an archival ephemeral film in the Prelinger Archives collection.

Chevrolet Leader News (Vol. 1, No. 3), an archival ephemeral film in the Prelinger Archives collection.

An overlooked place within Grand Canyon: Desert View Market & Deli.

An overlooked place within Ice Age Floods: Stout's bar at Little Money Creek.

An overlooked place within Morristown: Jockey Hollow Cemetery Monument.

A video featured by Wikimedia Commons: Alice in Wonderland (1903).

A music recording featured by Wikimedia Commons: Serenade Melancolique - Tchaikovsky.

A music recording featured by Wikimedia Commons: Pran chai chokkhu na chay (Rabindra Sangeet) on Piano by Paramanu Sarkar.

A music recording featured by Wikimedia Commons: Amar mukti aloy aloy (Rabindra Sangeet) on Piano by Paramanu Sarkar.

A music recording featured by Wikimedia Commons: Mozart Symphony 36 KV 425 Linz 3.

A music recording featured by Wikimedia Commons: Victimae Paschali Laudes.

A 32-second recording captures water resonating inside a suikinkutsu at a tea house in Daisen Park. The sound comes from drops falling through a small opening into a buried ceramic chamber.

A free online textbook in Languages: Salón de Clase: Intermediate Spanish for Education Professionals.

A free online textbook in Literature, Rhetoric, and Poetry: Writing Guide with Handbook.

A free online textbook in Cultural & Ethnic Studies: Gendered Lives: Global Issues.

A free online textbook in Journalism, Media Studies & Communications: Effective Professional Communication: A Rhetorical Approach.

A free online textbook in Medicine: Neuroscience for Pre-Clinical Students.

A free online textbook in Philosophy: Introduction to Philosophy: Epistemology.