A scuba diver exploring the underwater coral reef, surrounded by a blue hazy environment.

Tom Metcalfe

Tom Metcalfe is a freelance journalist based in London who writes mainly about science, archaeology, history, the earth, the oceans and space.

Latest from this author

An Aztec death whistle in the shape of a human skull.  When blown, a death whistle emits a realistic shriek, or scream.

Was it meant to mimic sounds of sacred winds or screams?

Prehistoric humans around the world figured out how to funnel game for easier kills.

Crab Nebula In The Constallation Of Taurus. Creator: Nasa.

The 19th-century Leviathan of Parsonstown allowed astronomers to zero-in on distant spiral objects.

Lighthouse of Alexandria on Pharos island

Built in the third century B.C., the towering structure was among the seven wonders of the ancient world.

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PaulKane - A Woman Weaving a Blanket (ROM2005 5163).

Before the introduction of domestic sheep in the Americas, some Indigenous people already had a source of their own "wool."

colorful painting of a large horse on wheels being pulled down a road

Some writers have struggled to rationalize the Trojans' gullibility.

Saint Sebastian Interceding for the Plague Stricken by Josse Lieferinxe

The Plague of Justinian peaked in the year 542 and lasted for two centuries, contributing to the fall of the Roman Empire.

Red silk fabric, red cloth material flying in the wind , 3d rendering

Silk has been made around the world since prehistory, but its trade flourished in ancient China.

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Death of Pliny The Elder in the eruption of Vesuvius, 79

The famous Roman writer was also a military commander who sailed across the Bay of Naples during the disaster.

Build a fire in winter, heating with wood

Did human ancestors use fire to cook their meat? Some argue it served another, more valuable purpose.

Machu Pichu

The dramatic interlocking stone walls at Machu Picchu have proven to be highly earthquake-resistant.

Mali - Bamako - Mixing purple dye

Knowledge of how to make the bright purple dye was a valuable trade secret to the Phoenicians.

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