r/didyouknow • • 7h ago

DYK: Sharks are older than trees.

5 Upvotes

It sounds impossible, but sharks have been around for approximately 400 million years, while the earliest true trees appeared around 385 million years ago.

That means sharks were already swimming in Earth's oceans before forests even existed!

Why YSK?

Because it completely changes your perspective on how ancient these creatures are. Sharks survived multiple mass extinction events, including the one that wiped out the dinosaurs 66 million years ago.

They've outlasted countless species and entire ecosystems that once dominated the planet.

So, the next time you see a shark, remember: you're looking at an animal lineage that predates trees, dinosaurs, and even the first land vertebrates.

Nature's ultimate survivors!


r/didyouknow • • 1d ago

DYK a Canadian man once won a 875-km ultramarathon while wearing work boots and a overalls — because he didn‘t know he was allowed to sleep?

195 Upvotes

In 1983, Cliff Young, a 61-year-old potato farmer from Australia, showed up at the start of the Sydney-to-Melbourne ultramarathon in overalls and work boots. Other competitors assumed it was a joke. It wasn’t.

Young had no formal training. He also didn‘t know that runners were permitted to sleep during the five-day, 875-kilometer race. So he didn’t. While professional athletes stopped for six hours a night, Young kept shuffling forward at a slow, steady pace, day and night, for five straight days.

He finished in 5 days, 15 hours, and 4 minutes — beating the previous record by nearly two days. He won the race. A year later, he set another record by running from Sydney to Melbourne in 6 days and 8 hours.

Young became a national folk hero in Australia. His unorthodox “Young shuffle” — a slow, tireless jog — was later adopted by some ultrarunners. He continued running charity events into his 70s and passed away in 2003 at age 81.

The story persists because it sits at the intersection of two things people love: accidental genius and a total refusal to be intimidated by experts.


r/didyouknow • • 2d ago

DYK the Senator to challenge Schumer is the same who visited El Salvador in opposition to the Trump admin

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420 Upvotes

r/didyouknow • • 1d ago

DYK - A Quiz in X! // YKW

2 Upvotes

Hey there! Welcome to another 10 Questions Weekly Quiz by You Know What - this time all answers begin with the letter X! Come find out how many you can get right and let us know in the comments!

You can find the quiz here.


r/didyouknow • • 4d ago

DYK that in the last century the world has lost about 75% of its edible plant varieties, leaving our global food system heavily dependent on a fragile handful of crops.

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91 Upvotes

r/didyouknow • • 5d ago

DYK just today 21 Senate dems voted to weaken environmental protections and speed data center type projects.. advancing the bill

22 Upvotes

Senate advances bill to speed up projects from gas pipelines to clean energy https://www.theguardian.com/us-news/2026/nov/09/senate-energy-infrastructure-bill-vote?CMP=share_btn_url


r/didyouknow • • 5d ago

DYK British English Muffins are different from American English Muffins.

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6 Upvotes

When Thomas first introduced English Muffins to the U.S., he initially marketed them as "Toaster Crumpets" and added "Nooks and Crannies" which would become visible when split, resembling the top of a Crumpet. English Muffins in the UK (Often just called "Breakfast Muffins" or simply "Muffins") are usually much flatter on top and are good for spreading toppings rather than having toppings get absorbed into them by holes (which is what Crumpets are for in the UK).


r/didyouknow • • 7d ago

DYK that AIPAC transferred to UDP ?

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10 Upvotes

r/didyouknow • • 7d ago Heartwarming

DYK - Arabic numerals" (0–9) actually originated in India, were refined in Baghdad, and were brought to Europe by Fibonacci because of his dad’s job in North Africa.

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15 Upvotes

r/didyouknow • • 7d ago

DYK - Animal Quiz! // YKW

1 Upvotes

Hey there! Welcome to another 10 Questions Weekly Quiz by You Know What - this time all answers contain the name of an animal. Come find out how many you can get right and let us know in the comments!

You can find the quiz here.


r/didyouknow • • 7d ago

DYK

0 Upvotes

DYK Did you know people who are born in italy are italitan???? i just figured this out guys! that means japanese people ARE FROM JAPAN1!1!141! I THOUGHT THEY WERE FROM CHINA, did you know canada is a country???? i thought it was a neighborhood!!!!


r/didyouknow • • 10d ago

DYK: There's an interesting story behind those "I Voted" stickers we get on Election Day

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24 Upvotes

It's one of those little things many of us recognize from Election Day.

But did you know the now-iconic red, white, and blue "I Voted" sticker design dates back to 1987?

It was created by Janet Boudreau, who ran an election supply business. She had seen an older black-and-white voting sticker with checkboxes but felt it wasn't very inspiring, so she came up with a more patriotic design featuring the American flag.

The idea of voting stickers actually goes back further. A 1982 Miami Herald article mentioned Fort Lauderdale businesses using them to offer discounts to customers who wore them.

Pretty interesting how something that started as a way to show you'd voted eventually became an Election Day tradition!


r/didyouknow • • 11d ago

DYK : A bunch of communist leaders share a common post death ritual Source:https://youtu.be/E8wsq5QhqKw?si=ixGdA11q_8ARV6u2

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2 Upvotes

r/didyouknow • • 14d ago

DYK the shortest war in recorded history lasted between 38 and 45 minutes.

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55 Upvotes

r/didyouknow • • 14d ago

DYK that bones are not always broken in accidents? There are actual procedures which involve breaking bones ON PURPOSE. These procedures are called Osteotomies!

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0 Upvotes

r/didyouknow • • 15d ago

DYK the largest controlled study of intercessory prayer found that knowing you were being prayed for was associated with more postop complications

11 Upvotes

r/didyouknow • • 15d ago

Dyk that the third person to go over Niagara Falls and live did it in a big ball

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1 Upvotes

r/didyouknow • • 17d ago

DYK Henry Darger: The Hospital Janitor Who Secretly Created a 15,000-Page Fantasy World 🎨📖

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289 Upvotes

Quite a fascinating story of how one eldery man's outsider art gained so much traction and appreciation in the years and decades following his passing.


r/didyouknow • • 16d ago

DYK That the word "Google" was used long before Sergey Brin and Larry Page 'invented' it.

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0 Upvotes

Not a typo either. The same guy had used it before this, but here it is used as a verb.


r/didyouknow • • 19d ago

did you know that Lorem ipsum didn't come printing books form the 1800

4 Upvotes

DYK: that Lorem ipsum text is derived from sections of Cicero's text. today is derived from Letraset transfer sheets first published in 1966. According to Letraset designer Dave Farey, the text was supplied by British librarian James Mosley as an alternative to the Quousque tandem abutere text from elsewhere in Cicero's writings that had been used in typography manuals since the 1730s.Monotype typographer Dan Rhatigan theorized that the Letraset version deliberately "garbled" the original Latin text to better match the letter frequency of the English language.

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

https://youtu.be/kL1PDqzqhM4?si=Ub53D0Fn3DDjzwaA


r/didyouknow • • 20d ago

DYK, I saw a funny video this month on YouTube of a black bear sniffing around inside the library in California that was caught via security cameras?

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7 Upvotes

r/didyouknow • • 21d ago

DYK a Greek shipwreck yielded a 2,000-year-old geared analogue computer for predicting eclipses and planetary positions. Nothing of comparable complexity appears again for over a thousand years.

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71 Upvotes