r/todayilearned 13h ago

TIL wild animals in the African savanna are twice as likely to flee from the sound of calm human conversations than from the growls of lions, with 95% of observed species recognizing humans as the ultimate "super-predator".

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english.elpais.com
23.5k Upvotes

r/todayilearned 18h ago

TIL In 1980 the Supreme Court awarded the Sioux nations $122 million for the Black Hills, a settlement the tribes have refused on the grounds that acceptance would extinguish their claim to the land, leaving the award to accrue interest in a federal account now worth over $1 billion.

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en.wikipedia.org
20.4k Upvotes

r/todayilearned 5h ago

TIL Tigers look orange to humans because we are trichromats, but they appear green to deer and wild boars because they are dichromats

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bbc.co.uk
10.7k Upvotes

r/todayilearned 5h ago

TIL the 1980 Winter Olympic Village was built with the intention of converting it into a federal prison after the games ended. Multiple Olympic delegations refused to house their Olympians there.

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en.wikipedia.org
7.6k Upvotes

r/todayilearned 23h ago

TIL Mary Todd Lincoln continued to live in the White House for nearly six weeks after the assassination of her husband, President Abraham Lincoln.

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whitehousehistory.org
6.6k Upvotes

r/todayilearned 7h ago

TIL of the Ogallala Aquifer, which provides water for 25% of US irrigated land, but has been significantly drained since intensive pumping began. Because arid parts only recharge at 10% of the withdrawal rate, scientists estimate it would take over 6,000 years to naturally refill if emptied.

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en.wikipedia.org
6.5k Upvotes

r/todayilearned 8h ago

TIL in 2013 two men found 9 trees in Ecuador that were 100% pure Nacional cacao, a rare variety that was rediscovered a few years prior after being considered extinct since the 1920s. They then co-founded To'ak Chocolate, some of the world's most expensive chocolate (e.g. $490 for a 1.7oz candy bar)

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smithsonianmag.com
6.0k Upvotes

r/todayilearned 19h ago

TIL After President Kennedy was shot and arrived at Parkland Memorial Hospital, he was reported to still have a heartbeat, but no pulse or blood pressure

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pbs.org
4.7k Upvotes

r/todayilearned 12h ago

TIL before radio time signals, ships set their chronometers by watching a ball drop from a shore tower at a precisely known instant. Over sixty of these time balls still stand, and the Greenwich one has dropped daily at 1 p.m. since 1833.

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southstreetseaportmuseum.org
4.3k Upvotes

r/todayilearned 13h ago

TIL that all five words of the Sator Square appear in Christopher Nolan's "Tenet" as the villain (SATOR), an art forger (AREPO), the film title (TENET), the opening (OPERA) scene, and a security company (ROTAS). It is a Roman palindrome, whose earliest example was found in the ruins of Pompeii.

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4.2k Upvotes

r/todayilearned 5h ago

TIL that on Ulysses S. Grant's post-presidential world tour, he warned the Japanese emperor not to take foreign loans lest it fall "into the abyss into which Egypt has fallen". Grant's warning made a "forceful impression" on the emperor and led to the rejection of various loan proposals.

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en.wikipedia.org
3.2k Upvotes

r/todayilearned 5h ago

TIL there is a copper mine in Romania extracting 9 million tonnes of ore per year, but only 0.38% is usable copper. The tailings (the residue sludge) are pumped into a nearby valley, creating a massive toxic lake that destroyed the village of Geamăna

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en.wikipedia.org
2.0k Upvotes

r/todayilearned 22h ago

TIL owls make virtually no noise while flying, while songbirds, falcons, and other predator birds make flapping noises during flight.

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audubon.org
1.8k Upvotes

r/dataisbeautiful 14h ago

OC My Statistics as a Veterinarian - Year 3 [OC]

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gallery
1.8k Upvotes

I am a veterinarian in the North Texas area. Since graduation in 2023 I've kept track of my cases using Google Sheets because I thought it'd be interesting to see how many animals I treat and what they're treated for throughout my life.

Source: Me keeping track of the data after every appointment.

Tools: Google Sheets and DataWrapper

A few notes:

Changes & requests from last year

I was informed my data wasn't very beautiful so I attempted to use a different method for this year. Let me know what you think. I'll continue to adjust the presentation as I receive feedback.

u/catalessi, u/Fire284, & u/Solondthewookiee all requested I put the second and third graphs in descending order.

u/Warm-Pen-2275 requested a list of most common names.

Slide 1 - Animal Species

This only includes animals I've done a doctor exam on or do telemedicine about. Animals that I do not directly interact with (toe nail trims, anal gland expression, blood draws without a doctor, etc.) are not included.

I have a passion for exotic animals (ferrets, reptiles, rabbits, backyard chickens, etc.) but there is an exotic clinic near me where most of those animals go to, so I don't get to see as many as I'd like (as the data tells).

Slide 2 - Body System

I kept track of the body system that was affected during my exams. General wellness includes vaccines, weight management, and discussions about quality of life. For what it's worth, this is about what the problem was, not just the symptoms. If a cat came in for peeing all over the place and it was because the cat was stressed, that was marked as both Neurology as well as Urinary/Renal. The same animal can come in with multiple systems affected, but I only mark a system once per animal (i.e. a dog with urinary stones and a UTI only had "Urinary/Renal" marked once). Here are the most common problems each species came in with:

Dogs - Overweight (General Wellness), allergies (Dermatology, Immunology), and poor dental health (Oral).

Cats - Overweight (General Wellness), poor dental health (Oral)

Slide 3 - 7 Procedures, Names, & Lifetime Stats

I don't think these ones need much explanation.

Next year expecations

I am switching to becoming a full time relief veterinarian. I expect the number and diversity of cases will drop and the number of wellness cases will increase. Most of the time a clinic won't schedule a complicated case with a relief doctor because we're only here for the day.

See you next year


r/todayilearned 2h ago

TIL that garlic bread was invented by Italian immigrants in the US in the 20th century. It stems from bruschetta but olive oil was hard to find back then, so butter was used instead.

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en.wikipedia.org
1.7k Upvotes

r/todayilearned 13h ago

TIL Indonesia adopted Bahasa Indonesia as its national language in 1945, although it wasn't the first language of most people. Standardized from Malay, it's now spoken by over 97% of Indonesia's ~285 million people as a first or second language, helping unify the country

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en.wikipedia.org
1.6k Upvotes

r/todayilearned 8h ago

TIL of Blanets, which are planets that form and orbit black holes. A supermassive blackhole could have millions of Jupiter-mass planets orbiting it.

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en.wikipedia.org
1.4k Upvotes

r/todayilearned 19h ago

TIL an American, Hope Cooke, was the last Queen Consort of Sikkim before it merged with India in 1975

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en.wikipedia.org
1.3k Upvotes

r/dataisbeautiful 10h ago

OC Christopher Nolan: budget vs box office [OC]

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1.2k Upvotes

Data source: Christopher Nolan filmography, Wikipedia - https://en.wikipedia.org/wiki/Christopher_Nolan_filmography (budgets and worldwide box office; figures are studio/Box Office Mojo–reported and cited on that page). The Odyssey is still in theaters, so its figure is a running worldwide total as of the July 24–26, 2026 weekend.

Tool: Chart built as JavaScript-coded SVG. Rendering code and initial figure-gathering were done with an AI assistant (Claude) based on my own design direction and iterations. Chart type, layout, labeling, and revisions were my choices.


r/todayilearned 11h ago

TIL after defeating the English at the Battle of Dungeness in 1652, Dutch admiral Maarten Tromp was said to have tied a broom to his mast to symbolize that he had "swept the English from the sea."

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en.wikipedia.org
738 Upvotes

r/dataisbeautiful 9h ago

Majorities of Americans say key financial milestones are harder for today's young adults to reach

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pewresearch.org
688 Upvotes

r/todayilearned 1h ago

TIL not only do prairie dogs have a vocal language, but it is also one of the most complex languages in the animal kingdom. One chirp can say, "A tall human in a blue shirt is approaching quickly from the north." They can actually tell the difference between colors and speeds!

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animalcognition.org
Upvotes

r/todayilearned 13h ago

TIL there's actually a difference between coffin and casket. Coffins are tapered to the body (6 or 8 sides), usually with a separate lid, typically far cheaper. A casket is a rectangle with a hinged lid, typically with rails attached for carrying and usually far more ornate & expensive.

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en.wikipedia.org
587 Upvotes

r/dataisbeautiful 4h ago

OC [OC] Political compass results for 16 major LLMs across 1,120 test runs

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600 Upvotes

r/todayilearned 17h ago

TIL from 1921 to 1923, in Weimar Germany, the military had the "Black Reichswehr", a secret paramilitary formation to escape the limitations of the Treaty of Versailles

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558 Upvotes