Coneixement de la comunitat

Descobreix Pandipedia

Un directori creixent de respostes útils seleccionades per la comunitat de Pandi. Cerca a la col·lecció o explora els darrers descobriments.

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Earth built nuclear reactors before humans

Earth built nuclear reactors before humans

Around 2 billion years ago, Earth ran nuclear reactors. Uranium deposits at Oklo, in what is now Gabon, sustained natural fission reactions—long before humans existed.

Actual drill-core pieces from the ancient natural nuclear reactors at Oklo — Naturhistorisches Museum Wien. Original Oklo drill-core specimen photograph resized; scale retained.
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A tiny wooden device that buries seeds

A tiny wooden device that buries seeds

This tiny wooden device buries seeds. No motor. No battery. Moisture makes the wood twist, helping the carrier work its way into the soil.

Time-lapse footage of the experimental wooden E-seed carrier burrowing — Carnegie Mellon / Morphing Matter Lab. Original research imagery; experimental device, documentary animation/frame.
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Trousers more than 3,000 years old

Trousers more than 3,000 years old

These trousers are more than 3,000 years old. Found at Yanghai in western China, they are among the oldest known surviving trousers. The patterned knees still look strikingly familiar.

The original Yanghai wool trousers, photographed from above — M. Wagner et al., Archaeological Research in Asia (2022), via Science News. Original research photograph/figure resized.
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Dinner from a cookbook written in clay

Dinner from a cookbook written in clay

This is a cookbook written in clay. Nearly 4,000 years ago, Babylonian recipes were recorded in cuneiform. One surviving tablet contains recipes for 25 stews.

The actual Babylonian culinary tablet YBC 4644, with recipes for 25 stews — Yale Babylonian Collection / CDLI. YBC 4644, YPM BC 018709, Old Babylonian culinary tablet. Original photograph resized.
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Guia de compra

Beginner crochet kits with a finished character

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30 USD
Pierre the Penguin Crochet Kit
Best forA first crochet character
 Comprar a thewoobles.com
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Llegeix la guia de compra: Beginner crochet kits with a finished character
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A keyboard that plays a cave

A keyboard that plays a cave

Sound on: this keyboard plays a cave. In Virginia’s Luray Caverns, the stalactites themselves are the instrument.

Sound on: a real performance on the Great Stalacpipe Organ — Rob Scallon / Luray Caverns. Documentary performance excerpt, unchanged sound and playback speed.
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Water droplets that travel uphill

Water droplets that travel uphill

These water droplets are travelling uphill. The track is heated and covered with tiny asymmetric ridges. Together, heat and texture propel the drops.

Real droplets moving uphill on a heated ratchet track — Science Friday / University of Bath researchers. Documentary excerpt; original playback speed retained.
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Flowers made of glass—even the rotten fruit

Flowers made of glass—even the rotten fruit

The leaves and petals of these plants were shaped from glass. Look closely: the veins, colours and delicate forms were carefully recreated by hand.

Harvard’s hand-crafted botanical glass models, shown in the university’s film — Harvard University. Film directed/edited by Ned Brown; cinematography Joe Sherman, Kai-Jae Wang and Ned Brown. Documentary excerpt/frame.
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Insects that build homes from gold and gemstones

Insects that build homes from gold and gemstones

These jewelled tubes were built by insects. The little creature inside is a caddisfly larva, carrying a protective case it assembled itself.

A caddisfly larva in its case assembled from supplied gold, pearls and gemstones — Hubert Duprat / Art:Concept / MONA. Photographs: Frédéric Delpech; original documentary animation via Colossal.
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The fish with eyes inside its transparent head

The fish with eyes inside its transparent head

Those two dots on this fish’s face aren’t its eyes. They’re its nostrils. Its real eyes are the green tubes inside its transparent head.

A barreleye’s transparent head and green tubular eyes in original deep-sea footage — MBARI. Original ROV footage; documentary excerpt/frame. Original watermark retained.