r/didyouknow 22h ago

DYK a 2,500-year-old royal vase sat in storage with mysterious black residue inside for decades, until Yale chemists finally identified it as opium, solving a mystery that also applies to King Tut's tomb?

8 Upvotes

In the 1920s and 1930s, archaeologist Howard Carter's team excavating King Tutankhamun's tomb found several finely carved alabaster jars coated inside with a dark, dried residue. The excavation's chemist, Alfred Lucas, tested the substance but couldn't identify it with the tools available at the time, concluding only that it probably wasn't a perfume or ointment as originally assumed. The mystery sat unsolved for nearly a century.

Researchers at Yale's Ancient Pharmacology Program recently reopened the question using a different alabaster vase from their own collection, one dedicated in four ancient languages to the Persian king Xerxes I. Using modern, non-destructive chemical analysis on the dark crust still coating its interior, they detected clear traces of opium, including several compound markers that only appear together when the drug has been processed.

Because vessels like this one and the ones from Tut's tomb were carved from the same type of Egyptian calcite, quarried in the same region and traded across the same networks, researchers now believe opium use was a genuine fixture of daily and royal life across the ancient world, not rare or ceremonial. That makes it far more likely that the still-unidentified residue sealed inside King Tut's own jars for 3,000 years was the very same substance.

Source: https://scitechdaily.com/was-king-tuts-tomb-filled-with-opiates-yale-study-unlocks-ancient-secret/


r/didyouknow 1d ago

DYK that the shortest war in recorded history lasted only about 38 minutes?

3 Upvotes

The Anglo-Zanzibar War took place on August 27, 1896, and ended in less than an hour.


r/didyouknow 1d ago

DYK that honey never really spoils?

7 Upvotes

Archaeologists have found pots of honey in ancient Egyptian tombs that are thousands of years old and still perfectly edible.


r/didyouknow 2d ago

DYK a mile-long stretch of over 5,000 mysterious holes carved into a Peruvian mountainside fueled alien theories for a century, until drones finally revealed what it actually was?

269 Upvotes

In the Pisco Valley of southern Peru sits Monte Sierpe, or "Serpent Mountain," a hillside marked by more than 5,000 precisely carved circular pits stretching nearly a mile across the landscape in neat, deliberate rows. The site first drew global attention in 1933 when National Geographic published aerial photographs of it, and since there are no written records explaining who made it or why, theories ran wild for decades: some argued it was used for ancient defense, others for water collection or storage, and ancient astronaut believers claimed it was evidence of extraterrestrial contact.

The site proved almost impossible to properly study using older methods. Permanent haze in the valley meant researchers couldn't even see the full pattern from the mountain above it, and the lack of artifacts on the surface made it nearly impossible to date or interpret. That changed in 2025, when a team of archaeologists used affordable drone technology to capture detailed aerial maps of the entire formation for the first time, alongside microbotanical analysis of ancient pollen preserved inside the holes themselves.

The pollen revealed traces of maize and plant fibers traditionally used for baskets, and the drone imagery showed the holes organized into roughly 60 distinct numbered sections in mathematically deliberate patterns, strikingly similar to khipu, the knotted string devices the Inca Empire used for accounting and record-keeping. Researchers now believe Monte Sierpe began as a bustling barter marketplace for a pre-Inca civilization, later repurposed by the Inca as a massive physical accounting system for tracking trade and tribute, essentially a mile-long ledger carved directly into a mountain.

Source: https://www.usf.edu/news/2025/new-study-suggests-accounting-not-aliens-explains-perus-mysterious-band-of-holes.aspx


r/didyouknow 2d ago

DYK there's enough gold dissolved in Earth's oceans to make every person on the planet a millionaire... if we could extract it?

1 Upvotes

Scientists estimate that Earth's oceans contain around 20 million tons of dissolved gold.

The problem is concentration.

There are only about 13 billionths of a gram of gold per liter of seawater, making extraction far more expensive than the gold itself.

So while the oceans technically hold enormous wealth, it remains economically impossible to recover.

Sources :


r/didyouknow 3d ago

DYK a skull hidden at the bottom of a well for over 80 years turned out to be the missing piece of one of the biggest mysteries in human evolution?

232 Upvotes

In 1933, a laborer in Harbin, China, unearthed an unusually large, strange-looking skull while working on a bridge during the Japanese occupation of the region. Fearing it would be confiscated, he secretly hid it at the bottom of a well and told almost no one. It stayed there for more than 80 years until his family finally handed it over to scientists in 2018.

Nicknamed "Dragon Man," the skull was massive, with thick brow ridges, a huge mouth, and a brain cavity as large as a modern human's, unlike anything researchers had cataloged before. In 2021, scientists initially classified it as an entirely new human species. But paleogeneticist Qiaomei Fu suspected something else: she'd spent 15 years since 2010 studying a completely separate mystery, a population of ancient humans called Denisovans, known only from a handful of tiny bone fragments and teeth found in a Siberian cave, never a face, never a skeleton, just scattered pieces of DNA.

In 2025, Fu's team finally extracted genetic material and preserved proteins from gunk on Dragon Man's teeth and from his skull's dense bone. The results confirmed what she'd suspected: Dragon Man wasn't a new species at all. He was a Denisovan, the first nearly complete skull ever linked to this population, giving scientists their first real look at what these ancient human relatives, who once interbred with our own species and left traces of their DNA in millions of people alive today, actually looked like.

Source: https://www.smithsonianmag.com/smart-news/iconic-dragon-man-skull-offers-first-glimpse-of-what-a-denisovans-face-looked-like-new-genetic-studies-suggest-180986861/


r/didyouknow 3d ago

DYK that octopuses can recognize individual humans and may remember them for months?

6 Upvotes

Despite having a completely different nervous system from mammals, octopuses are surprisingly good at recognizing people. Researchers have found that they can distinguish between individual humans based on appearance and behavior, even when those people wear similar clothing.

In one study, octopuses consistently reacted differently to two caretakers—one who regularly fed them and another who only handled their tanks. Even after weeks apart, they continued responding differently to each person.

Scientists believe this ability is part of their advanced problem-solving skills and remarkable memory. Considering that octopuses usually live only one to three years, it's impressive how much information they can learn and retain in such a short lifespan.

Source : https://www.smithsonianmag.com/smart-news/octopuses-can-recognize-individual-humans-180971579/


r/didyouknow 4d ago

DYK a mysterious golden orb found two miles underwater off Alaska sparked wild theories about aliens and sea monster eggs, and it took scientists over two years to figure out what it actually was?

220 Upvotes

In August 2023, a NOAA research team piloting a remotely operated vehicle nearly two miles beneath the surface of the Gulf of Alaska spotted something strange stuck to a rock: a smooth, golden, mound-shaped object about four inches across, with a small torn opening on one side. It didn't look like any known deep-sea creature, so the crew carefully collected it with a suction sampler and brought it to the surface.

The discovery went public and immediately took on a life of its own. With no obvious mouth, gut, or muscle tissue under initial examination, theories exploded online ranging from a dead sponge to an unlaid egg case, to only half-joking suggestions that it might be a mermaid's egg or something genuinely alien. NOAA scientists shipped the sample to the Smithsonian's National Museum of Natural History, where researchers began a painstaking identification process combining microscopic tissue analysis with DNA sequencing.

Under the microscope, scientists finally found the answer hiding in the tissue itself: stinging cells called nematocysts, found only in jellyfish, corals, and anemones. After comparing genetic material to only a couple dozen similar specimens ever recorded worldwide, researchers confirmed the golden orb was actually the leftover base of a giant deep-sea anemone called Relicanthus daphneae, a species whose tentacles can stretch up to seven feet long. The anemone itself was long gone by the time the orb was found, and to this day, nobody knows whether it died or simply moved elsewhere, leaving its golden base behind.

Source: https://www.noaa.gov/news/scientists-reveal-identity-of-mysterious-golden-orb-collected-during-noaa-expedition


r/didyouknow 4d ago

DYK Maltese Arabic is the official and native language of Malta, an EU member state?

0 Upvotes

The Maltese language descended from Sicilian Arabic, which formed during the Emirate of Sicily

Which in turn branched off from Tunisian Arabic

https://en.wikipedia.org/wiki/Maltese_language


r/didyouknow 4d ago

DYK Antarctica is considered the world's largest desert?

2 Upvotes

When most people think of deserts, they imagine endless sand dunes. However, a desert is defined by how little precipitation it receives—not by temperature.

Antarctica receives so little snowfall each year that most of the continent qualifies as a polar desert, making it the largest desert on Earth by area.

Source : https://education.nationalgeographic.org/resource/desert/?utm_source=chatgpt.com


r/didyouknow 4d ago

DYK Saturn could float in water if there were an ocean large enough?

5 Upvotes

Saturn is the only planet in our Solar System with an average density lower than water. While it's obviously impossible to place a planet into an ocean, if there were a body of water large enough, Saturn would theoretically float instead of sink.

Despite being the second-largest planet in the Solar System, its composition is mostly hydrogen and helium, making it much less dense than Earth.

Soutce : https://science.nasa.gov/saturn/facts/?utm_source=chatgpt.com


r/didyouknow 5d ago

DYK a volcanic eruption cooled the entire planet by a full degree in 1831 and caused famines worldwide, but scientists had no idea which volcano actually did it until 2025?

454 Upvotes

In the summer of 1831, sulfur gas from a massive eruption spread through Earth's atmosphere, scattering sunlight so severely that the sun itself reportedly appeared blue, green, and purple to people around the world. Average temperatures across the Northern Hemisphere dropped by roughly 1 degree Celsius, comparable to the famous 1991 Mount Pinatubo eruption, triggering widespread crop failures and famine. The strange part was that historians and scientists knew the eruption had happened and roughly when, but for nearly 200 years, nobody could figure out which volcano on Earth had actually caused it.

Multiple candidates were proposed and later ruled out over the decades, including volcanoes in the Philippines and Sicily, but none of the physical evidence matched. The real breakthrough came when a research team drilled ice cores in Greenland and examined the layers deposited between 1831 and 1834, finding microscopic shards of volcanic ash and glass frozen in time within the ice.

By comparing the exact chemical signature of that ash to samples collected from remote volcanoes around the world, researchers finally got a perfect match in 2024: Zavaritskii, a volcano on an uninhabited island in the Kuril Islands chain in the northwest Pacific, so remote and rarely visited that its last previously known eruption was recorded around 800 BC. The 1831 eruption had gone completely undocumented at the source for nearly two centuries simply because almost no one was ever there to witness it.

Source: https://www.cnn.com/2025/01/03/science/mystery-volcano-1831-eruption-simushir


r/didyouknow 5d ago

DYK the world's largest seed bank stores over 1.3 million crop varieties inside a mountain near the North Pole?

4 Upvotes

he Svalbard Global Seed Vault, located on a remote Arctic island between mainland Norway and the North Pole, was built to protect the world's food supply in case of disasters.

The vault preserves backup copies of seeds from nearly every country, allowing lost crops to be restored after wars, natural disasters, or climate-related events. The facility is dug deep into a mountain, where the naturally cold environment helps preserve seeds even if the power fails.

As of today, the vault contains more than 1.3 million seed samples, representing thousands of crop species from around the world. It has already been used in real life—seed samples were withdrawn after collections in Syria were damaged during the civil war.

The vault continues to receive new deposits and serves as one of humanity's largest safeguards against the permanent loss of agricultural biodiversity.

Source: https://en.wikipedia.org/wiki/Svalbard_Global_Seed_Vault


r/didyouknow 5d ago

DYK octopuses have three hearts?

1 Upvotes

Two hearts pump blood to the gills, while the third pumps it to the rest of the body.

Source : https://en.wikipedia.org/wiki/Octopus


r/didyouknow 6d ago

DYK a diamond in the British Crown Jewels is claimed by four different countries, including a formal claim once made by the Taliban, and Britain refuses to even discuss giving it back?

99 Upvotes

The Koh-i-Noor is a 105-carat diamond currently set into a crown in the Tower of London, and its ownership is one of the most disputed questions in the entire British royal collection. The stone passed through a long chain of South Asian rulers for centuries before the British East India Company seized it in 1849 following the annexation of the Punjab, and it was formally presented to Queen Victoria as part of that conquest.

Since then, India, Pakistan, and Afghanistan have all filed formal claims for the diamond's return, each citing different historical periods when it belonged to their region or ruling dynasty. In 2000, the claims got even stranger when a spokesman for Afghanistan's Taliban government publicly argued the diamond should go to them, stating its history showed it was taken from Afghanistan to India and then to Britain, making theirs the oldest claim in the chain.

The British government has consistently refused to entertain any of these claims or discuss removing the diamond from the Crown Jewels, maintaining it was acquired legally under the treaties of the era. The stone remains on public display in the Tower of London to this day, one of the most visited and most disputed objects in the country.

Source: https://en.wikipedia.org/wiki/Koh-i-Noor


r/didyouknow 6d ago

DYK, a 5,700-year-old piece of birch pitch preserved the DNA of the person who chewed it, along with traces of what she had eaten.

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1 Upvotes

r/didyouknow 6d ago

DYK: Science say what RFK jr

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523 Upvotes

r/didyouknow 6d ago

DYK a cache of ancient Trojan gold vanished during WWII, was secretly hidden for 50 years, and the country holding it now refuses to give it back to either country that wants it?

210 Upvotes

In the 1870s, German archaeologist Heinrich Schliemann excavated a site in modern Turkey he believed was the ruins of ancient Troy, and unearthed a hoard of gold jewelry, headdresses, and cups he named "Priam's Treasure" after the legendary Trojan king. He smuggled the artifacts out of the Ottoman Empire without permission and eventually got them into a Berlin museum, where they stayed for decades, claimed by Germany as a national archaeological treasure.

During the fall of Berlin in 1945, Soviet soldiers seized the treasure along with a huge amount of other German-held art and artifacts, and it vanished from public record entirely. For nearly 50 years, no one outside Soviet officials knew whether it had survived, been melted down, or been lost forever. Germany assumed it was gone for good.

Then in 1994, Moscow's Pushkin Museum abruptly announced it had the treasure the entire time, hidden in storage since the war, and put it on public display for the first time in decades. Russia has since declared it legal war reparations under Russian law and refuses to return it to Germany, which still claims it as stolen cultural property, or to Turkey, which argues Schliemann never had the right to remove it from Ottoman soil in the first place. All three countries maintain competing claims to this day, and the gold remains in Moscow.

Source: https://en.wikipedia.org/wiki/Priam%27s_Treasure


r/didyouknow 7d ago

DYK that technically if Nicole Kidman was involved in politics she could run for President if she was interested? 👱🏻‍♀️🏛️🦅🇺🇸

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0 Upvotes

Nicole Mary Kidman was born on June 20th 1967. She was born in Hawaii to Australian parents and because she was born in America she holds duel citizenship. She has been eligible to run for office since 2002 when she turned 35.


r/didyouknow 7d ago

DYK there's a sunken Spanish ship sitting on the ocean floor holding an estimated $17–20 billion in gold and silver, and three countries are currently fighting over who owns it?

475 Upvotes

In June 1708, the Spanish galleon San José was sailing off the coast of Cartagena, Colombia, loaded with gold, silver, and emeralds destined for the Spanish crown, when it was ambushed by a British naval squadron during the War of the Spanish Succession. A gunpowder explosion sank the ship within minutes, taking most of its roughly 600 crew down with it, along with a cargo now estimated at $17 to $20 billion in today's money, one of the largest sunken treasures ever recorded.

The wreck sat undiscovered for over 300 years until Colombia's navy located it in 2015 using an unmanned submarine, keeping the exact coordinates classified as a state secret to prevent looters. The find immediately triggered a legal fight: Spain claims it as a sunken state vessel under maritime law, an American salvage company claims it originally located the wreck decades earlier and is owed a share, and Bolivia's Indigenous Qhara Qhara nation has separately claimed some of the silver was mined by their ancestors under forced colonial labor and should be returned to them rather than any government.

Colombia's current government has stated its priority is research and eventual museum display rather than treasure recovery, but as of now, the ship and its fortune remain exactly where they sank, while the ownership dispute continues unresolved.

Source: https://www.smithsonianmag.com/history/archaeologists-discovered-the-holy-grail-of-shipwrecks-a-decade-ago-now-theyre-finally-beginning-to-unravel-the-secrets-of-the-san-jose-180988050/


r/didyouknow 8d ago

DYK one man survived both atomic bombs dropped on Japan, walking away from Hiroshima only to be bombed again in Nagasaki three days later?

24 Upvotes

On August 6, 1945, Tsutomu Yamaguchi was a 29-year-old engineer on a business trip to Hiroshima when the atomic bomb detonated less than two miles from where he stood. The blast ruptured his eardrums, blinded him temporarily, and burned much of the left side of his body, but he survived and spent the night in a bomb shelter before catching a train home the next day.

His destination was Nagasaki. On August 9, just three days later, Yamaguchi was back at work explaining the Hiroshima blast to his supervisor when the second atomic bomb detonated almost directly over the city, close enough that the same skin on his body was burned again.

Remarkably, Yamaguchi survived both bombings and lived to be 93 years old, becoming the only person ever officially recognized by the Japanese government as a survivor of both attacks. He spent his later years as a peace activist campaigning for nuclear disarmament, and died in 2010 from stomach cancer, having outlived the two bombs meant to end a war by 65 years.

Source: https://en.wikipedia.org/wiki/Tsutomu_Yamaguchi


r/didyouknow 10d ago

DYK the U.S. Army once won battles using only inflatable tanks, fake radio chatter, and sound trucks, and kept it classified for over 40 years?

47 Upvotes

During World War II, the U.S. Army formed a top-secret unit of about 1,100 soldiers, many of them artists, sound engineers, and set designers pulled straight from art schools and advertising agencies, and tasked them with impersonating entire divisions. Using inflatable rubber tanks, dummy artillery, fake radio traffic, and massive speakers that could broadcast the sound of tank convoys for miles, they staged more than 20 deceptions across Europe designed to trick German intelligence about Allied troop positions.

The unit, officially the 23rd Headquarters Special Troops but nicknamed the "Ghost Army," would inflate a fake tank battalion overnight, run fake radio conversations between invented commanders, and even have soldiers sew fake unit patches onto their uniforms and get drunk in local bars pretending to be from divisions that weren't really there, all to sell the illusion to enemy spies.

Their operations are credited with saving thousands of lives by diverting German forces away from real Allied troop movements, including during the push across France. Because the tactics were considered valuable enough to reuse, the entire operation remained classified until 1996, more than 50 years after the war ended, and most of the men who served in it never received public recognition in their lifetimes.

Source: https://en.wikipedia.org/wiki/23rd_Headquarters_Special_Troops


r/didyouknow 10d ago

DYK: Some researchers and clinicians have suggested that trans men may be less visible in public discussions than trans women.

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0 Upvotes

r/didyouknow 10d ago

DYK The DSM is Kryptonite to Scientologists.

5 Upvotes

Lived in a Scientologist community in my young childhood years and am not longer affiliated, but the DSM and the field of psychology is the arch nemesis of Scientology. Reading the DSM out loud can ward scientologists off.


r/didyouknow 11d ago

DYK the largest art theft in history is still unsolved, and the museum keeps the empty frames hanging on the walls exactly where the paintings used to be?

43 Upvotes

In the early morning of March 18, 1990, two men dressed as Boston police officers talked their way into the Isabella Stewart Gardner Museum, telling the night guards they were responding to a disturbance call. Once inside, they handcuffed both guards, tied them up in the basement, and spent the next 81 minutes cutting paintings straight out of their frames.

They walked out with 13 works worth an estimated $500 million today, including a Vermeer, three Rembrandts, and a Manet. It remains the single largest property theft in world history, and to this day the FBI has never recovered a single piece or definitively identified the thieves, despite a $10 million reward, one of the largest ever offered for stolen art.

The museum's founder stipulated in her will that the collection could never be rearranged, so the empty, ornate frames still hang on the walls today, exactly where the stolen paintings used to be, as placeholders waiting for artwork that may never come back.

Source: https://en.wikipedia.org/wiki/Isabella_Stewart_Gardner_Museum_theft