SIGN UP for our newsletter ✉️ :

Get the latest stories delivered straight to you

33 Facts That Seem Wildly Improbable But Are Unbelievably True

Recently, Reddit user CivilReaction asked, "What’s a fact that sounds fake but is 100% true?" and there were some super interesting and surprising responses — here's what people had to say!*

*Along with some replies from this post and the Reddit thread it rounded up.

1.There have been studies that show that people's heart rates synchronize to a degree with music's rhythm...and people listening to the same story or song, or even watching a movie together, actually synchronize not only their heart rate but their breathing and some of their movements).

cartoon mouse with its heart beating out its chest

Suggested by u/Suspicious-Bug774


2.Here's another fascinating fact about the human body: Your blood type can actually change if you receive a bone marrow transplant. Not only that, but you'll have different sets of DNA in your blood versus other parts of your body (like skin cells, saliva, hair, teeth) — meaning that if you were involved in a crime, you might leave the DNA of your donor. Oh, and also you may develop the allergies of your donor.

crime scene tape

3.One more weird body fact — "Your ribs, if removed, can actually grow back as long as the perichondrium membrane is intact. They're the only bones in mammals known to do so."

hands holding up an x-ray
Fs Productions / Getty Images/Tetra images RF

4.We all know and love Häagen-Dazs ice cream, yes? Like me, you probably assumed it was European. Nope! It was founded by the Polish and Jewish couple Reuben and Rose Mattus in the Bronx, New York. And "Häagen-Dazs" is just gibberish – the couple made it up because they thought a foreign-sounding name would make their ice cream sell better, and they went with a Danish-sounding name because of Denmark's actions to save Jewish people during WWII.

Suggested by u/FLEXXMAN33 and u/ST616

5.Speaking of product names — Pepsi was originally called "Brad's Drink," after Caleb Davis Bradham, who created it. When it was renamed, "Pepsi" came from a word for indigestion, because the cola drink was meant to soothe your stomach. It was originally sold at pharmacies (as was Coke).

shelf of pepsi
Roberto Machado Noa / LightRocket via Getty Images

6.Whenever you shuffle a deck of cards to create a new order, it is almost guaranteed that that specific order has never before existed in the history of card-playing. In fact, according to this article from McGill, there are more ways to order a deck of cards than there are atoms on Earth — and "even if someone could rearrange a deck of cards every second of the universe’s total existence, the universe would end before they would get even one billionth of the way to finding a repeat."

hands shuffling a deck of cards

7."The population of the Earth would fit inside Texas at the same density as NYC."

crowded street in new york
Andy Ryan / Getty Images

8."John Adams and Thomas Jefferson both died on the 50th anniversary of the signing of the Declaration of Independence."

portrait of adams

9.In case you want to completely distort your sense of history, Pocahontas and William Shakespeare died within a year of each other, and less than 150 miles apart from each other.

portrait of her

10.Anne Frank, Martin Luther King Jr., and Barbara Walters were all born in the same year: 1929.

photo of anne

11.And to further distort your sense of history..."There was a time when a samurai could have sent a fax to Abraham Lincoln. The fax machine was invented in the 1840s, and the first commercial fax service was started in 1865. Samurai were around until the late 1870s, and Abraham Lincoln was alive until 1865."

portrait of lincoln

12.Speaking of Abe — "Joe Biden was born closer to Abraham Lincoln’s second inauguration than he was to his own."

closeup of biden
JIM WATSON/AFP via Getty Images

13."John Tyler, the tenth president of the US, has a living grandchild (as of May of this year)."

portrait of john tyler
Mikroman6 / Getty Images

14."The timespan between the use of copper swords and then steel swords is longer than the timespan between the use of steel swords and the nuclear bomb."

closeup of a steel sword

15."Lighters were invented before matches."

hand holding a lit lighter
Dhaqi Ibrohim / Getty Images

16.And..."Canned food was invented about 100 years before can openers."

can being opened
Danbrandenburg / Getty Images

17."-40C and -40F are the same temperature."

cartoon in the freezing cold

18."A kind of moth is found in Madagascar that almost entirely subsists on the tears of sleeping birds."

closeup of a bird's eye
Aroonz Photography / Getty Images/500px Prime

19.Another fun bug fact: "Dung beetles navigate using the Milky Way."

closeup of a beetle
Paul Souders / Getty Images

20."There are more castles in Germany than there are McDonald's In the United States."

Celal Gunes/Anadolu Agency via Getty Images, John Wang / Getty Images

21."Drinking a good amount of 100% pure water will kill you. It will leech vital minerals out of your body."

person drinking a glass of water

22.Kangaroos have three vaginas — and the third one only forms during pregnancy.

kangaroo with a baby in her pouch

23.Oh, and in case you're wondering, here's what the inside of a kangaroo's pouch looks like — with a baby inside!

vein-y inside
@animaledventures / Via

24.Cows are the deadliest animal in the UK.

cows eating grass

Suggested by u/scooba_dude

Ping Shu / Getty Images

25."Octopuses have a brain in each of their tentacles as well as a main one in their body."

closeup of an octopus
Fred Tanneau / AFP via Getty Images

26.Puppies in the same litter can each have a different father.

puppies in someone's lap

Suggested by u/tinka844

Slavica / Getty Images

27.And this is possible in human fraternal twins as well.

twin babies crawing
Jill Lehmann Photography / Getty Images

28."The guy that invented dynamite also created the Nobel Peace Prize."

cartoon penguin saying, kaboom while holding an explosive
20th Century Fox

29."Coffee is not a bean. It is the pit of the coffee plant which is a fruit."

Nenov / Getty Images

30.And relatedly...Bananas are berries, but strawberries, raspberries, and blackberries are not.

fruit spread out

31.Australia is wider than the moon: the moon is 3400 kilometers wide while Australia is 4000 kilometers wide.

map of australia
Frankramspott / Getty Images

32."Alaska is the northernmost, the westernmost, and the easternmost state in the United States."

alaska on a globe
Lightguard / Getty Images

33."And Maine is the closest state to Africa."

world map
Yevhen Borysov / Getty Images

34.And finally..."Most people have an above-average number of limbs."

woman in disbelief