Weird facts you can actually trust.

From the air, lines of holes across Iran's deserts look like craters.

Ming-dynasty builders boiled sticky rice into a thin soup and mixed it into lime mortar.

These stone steps near Arles, in southern France, are what's left of the Barbegal mills: a Roman water-powered factory built around 120 to 130 AD.

More than half of the Colosseum's outer wall is missing, and it wasn't bombs or weather.

The Great Sphinx of Giza lost its nose long before Napoleon reached Egypt in 1798.

A painting in the tomb of Djehutihotep (El-Bersheh, Egypt, c.

When Mount Vesuvius erupted in AD 79, a building crew in Pompeii left a wall half-finished, with piles of raw materials still on site.

Those holes all over the Colosseum are not battle damage.

King Tut’s dagger was made from meteorite iron.

Pliny the Elder claimed Roman harbor concrete got "every day stronger" under the sea.

The Great Pyramid was built white: smooth, polished limestone from base to tip, and about eight metres taller than it is today.

Machu Picchu’s terraces hide an extensive drainage system.

Two miles from Stonehenge, around 2500 BC, people raised rings of timber posts now called Woodhenge, lined up on the midsummer sunrise like Stonehenge.

Ice in a desert summer had a winter supply chain.

Rust helped protect Delhi’s iron pillar for roughly 1,600 years.

Those rough blocks were never meant to be the Great Pyramid’s finished surface.

In 1860, a crew of 600 men using 6,000 jackscrews raised a row of brick buildings on Lake Street in Chicago 4 feet 8 inches in five days while the businesses inside stayed open.

A 4,500-year-old ramp found at Egypt's Hatnub quarry in 2018 climbs at roughly a 20 percent slope, far steeper than the gentle ramps long assumed, with staircases and post holes for hauling stone sleds by rope.

Rome's Pantheon, finished around 125 AD, still holds the record for the world's largest unreinforced concrete dome, nearly 1,900 years later.

A cold drink in Calcutta could contain ice shipped from another continent.

Put a boat into a water-filled lift and its total weight stays the same.

The ancient Greeks built the Diolkos, a paved stone trackway across the Isthmus of Corinth, and hauled ships overland on it for centuries; a canal across the Isthmus was attempted by Nero in AD 67 and not completed until 1893.

Terracotta Army figures were painted, but the lacquer under the paint curls about fifteen seconds after excavation; conservators spray polyethylene glycol within seconds to save the color, and only about a quarter of the estimated 8,000 figures have been dug up.

Ancient Greek and Roman marble statues were originally painted in vivid pigments, and their now-familiar bare white appearance is the result of that paint eroding away over roughly two thousand years, not the sculptors' original design.

Amsterdam's water authority Waternet pulls roughly 12,000 to 15,000 bikes out of the city's canals every year, and the Netherlands has more bicycles than people: Dutch industry groups BOVAG and RAI estimate about 24 million bicycles for a population of just over 18 million.

Between 1999 (a trial) and 2001, engineers removed about 38 cubic metres of soil from beneath the raised north side of the Leaning Tower of Pisa, straightening it by about 45 cm back to its 1838 position while deliberately keeping its lean.

Natural diamonds crystallize roughly 90 to 150 miles down in Earth's mantle under immense heat and pressure, far deeper than any coal seam has ever existed, and many diamonds are over a billion years old — older than the first land plants that would eventually become coal.

A Roman vomitorium was an arched stone passageway built into amphitheaters like the Colosseum to let large crowds of spectators enter and exit quickly — the name comes from the Latin "vomere" (to spew forth), describing the crowd pouring out, not food being purged.

Every known bat species has functional eyes — even echolocating microbats retain working vision, and fruit bats (megabats) have excellent low-light eyesight, so no bat species is truly blind.

The 1917 Halifax Explosion — when the munitions ship Mont-Blanc caught fire and detonated in the harbour — was the largest accidental explosion in history before the atomic age, so violent it hurled one of the ship's anchor shanks, weighing about 1,140 pounds, roughly two miles across the city into the Armdale neighbourhood.

No genuine medieval iron maiden has ever been documented; every surviving specimen, including the famous example once displayed in Nuremberg, was assembled in the early 19th century from mismatched old armor parts and sold to museums and showmen as a curiosity, with an invented medieval backstory added later.

Archaeologists excavating Pompeii have found a thermopolium — an ancient Roman street-food counter — with its serving vessels still embedded in the stone counter, some still containing traces of the food that was sold there on the day of the eruption in 79 AD, including duck, pig, fish, and snail.

Earth continuously loses hydrogen and helium from its upper atmosphere to space through atmospheric escape, and this has been happening throughout its history.

A banana is botanically a berry while a strawberry is not, because a true berry develops from a single ovary with its seeds embedded in the flesh.

Wombats are the only known animals that produce cube-shaped droppings, formed by varying elasticity along the walls of their intestines.

A 2014 study found water chemically bound inside ringwoodite in Earth's mantle transition zone, suggesting the deep mantle may hold a comparable volume of water to the oceans — bound in mineral structure, not as liquid.

Honey essentially never spoils: its very low moisture, high acidity, and natural hydrogen peroxide make it inhospitable to microbes, and archaeologists have reported edible 3,000-year-old honey from ancient Egyptian tombs.

Tyrannosaurus rex lived closer in time to humans than to Stegosaurus: Stegosaurus went extinct around 150 million years ago and T. rex around 66 million years ago, so more time separated those two dinosaurs than separates T. rex from us today.

There are more trees on Earth — roughly 3 trillion — than there are stars in the Milky Way, which NASA estimates at 100 to 400 billion.

Saturn is the only planet in the solar system less dense than water: its average density is about 0.69 grams per cubic centimetre, so given a big enough ocean, Saturn would float.

Sharks have existed for roughly 450 million years, which means they predate the first trees — which appeared around 385 million years ago — by about 65 million years.

In healthy adults, approximately 10% of the skeleton is replaced by bone remodelling each year, meaning the process cycles through the entire skeleton roughly once per decade on average — but trabecular (spongy) bone at sites like the vertebrae turns over far faster, renewing completely in as little as 3 to 4 years, while dense cortical bone renews much more slowly.

IBM's 350 RAMAC, the first hard disk drive, was introduced in 1956, weighed roughly one tonne, and stored 5 million characters — under 4 megabytes, less than a single photo from a modern phone — across 50 spinning platters each 24 inches across.

Canada has more lakes than any other country on Earth — over 2 million of them, more than any other single nation, though still fewer than all the rest of the world's countries put together — and Canada holds about 20 percent of the world's total fresh water.

Humans do not have only five senses; neuroscientists recognize at least nine distinct senses, including proprioception (body position), vestibular sense (balance), interoception (internal body state), nociception (pain), and thermoception (temperature), each served by dedicated receptors and neural pathways.

Octopuses have three hearts: two branchial hearts that pump deoxygenated blood through the gills, and one systemic heart that pumps oxygenated blood to the rest of the body — and the systemic heart stops beating entirely while the animal swims, which is why octopuses prefer crawling.

The first computer bug was an actual moth found trapped in a relay of the Harvard Mark II computer on September 9, 1947, and it was taped into the operators' logbook with the note 'First actual case of bug being found.'

In 1518, a dancing plague broke out in Strasbourg where roughly 400 people danced uncontrollably for days on end, with city authorities responding by hiring musicians and opening a guild hall to keep the dancers moving, believing more dancing would cure them.

A day on Venus (one full rotation on its axis) takes about 243 Earth days, which is longer than Venus's own year of about 225 Earth days, meaning a Venusian day is longer than a Venusian year.

The ancient Romans used a concrete called opus caementicium that contained seawater and volcanic ash (pozzolana), and marine structures built with it have been found to be stronger after 2,000 years of seawater exposure than when they were first poured, because seawater triggers the continued growth of a rare mineral called tobermorite within the concrete.

The human liver can regenerate to its full original mass even after up to 70% of it has been surgically removed, with most regrowth within months and full recovery up to a year.

The wood frog (Rana sylvatica) survives being frozen solid for weeks each winter — its heart stops, its blood stops flowing, and up to 65% of its body water turns to ice — then it thaws and hops away in spring.

If you've ever messed with a crow, it will remember your face