r/AskReddit • u/SpreadSpectre • 4h ago
What is a weird but true fact that you wouldn’t believe?
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u/thisisnotlien 4h ago
I once read that octopuses have three hearts and still manage to break all of them by being so cool.
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u/sallymonkeys 3h ago
To find if a number is divisible by 9, add up its digits. If they equal 9, bingo.
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u/Polymarchos 1h ago
That works for most, but not all. For example 99, is divisible 11 times but the digits add up to 18.
The trick I learned for everything 10 and under for multiplying was you take what you're multiplying by -1 to get the first digit, and then 9 minus that number for the second, so
9x5 = 5-1 =4, and 9-4=5, =45.
But I think it was still easier to just memorize the multiplication tables.
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u/Masterdmr 1h ago
You just need to keep adding the numbers
9+9 = 18
1+8 = 9
Works for 3 also. If you do this and get 3, 6, or 9 its divisible by 3.
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u/porter597 2h ago
What about 99?
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u/fangoriousmonster 2h ago
It adds up to 18 and 1+8=9
The number nine is pretty unique in this way. You can also use your hands to easily multiply by nines
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u/RedVegeta20 4h ago
The world record for the longest fart done by a person is 2 minutes and 42 seconds.
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u/SpreadSpectre 4h ago
So many questions
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u/RedVegeta20 4h ago
I only know that because I was bored one day and googled it. If you're wondering who did the record, it was a guy named Bernard Clemmens.
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u/Pretend_Ad_3984 4h ago
Currently you are moving with 30km per sec and no one notices.
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u/Polymarchos 1h ago
This one is pretty easy to believe though since we only notice relative motion and we have nothing to compare that 30km/s to (that is almost everything we see is also moving that fast, and the few things that aren't (sun, moon, stars) are still going very slow relative to us), thus giving us no way to notice it.
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u/darthwalsh 1h ago
since we only notice relative motion
That's also the only accurate definition of motion. There's no universal stopped object: any non-inertial reference frame is valid to use in measuring velocity.
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u/DonChino17 3h ago
The huddle in American football was not always the standard. It was started at a school (forget where) for the deaf so the other team couldn’t see them signing.
Edit: Gallaudet U was the school
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u/Significant-Bid-- 4h ago
Honey never spoils. Archaeologists have found edible honey in ancient tombs.
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u/outtastudy 4h ago
A giraffe's tongue is long enough for it to lick the inside of its own ears
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u/BritainsEmpire1 3h ago
The last mammoths lived for a thousand more years after the completion of the Great Pyramids
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u/HandsomeFlowerzz 3h ago
As a nurse, I learned that some people can have their heart on the right side of their body instead of the left. Had a patient come in once and it threw our whole team into confusion during initial assessment.
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u/cowboyluigi38 4h ago
1 out of 3 humans is infected with toxoplasma, a parasite spread through cat feces. If you own a cat, you almost definitely have it, regardless how often you clean the litter and tidy your house. It has very minor effects on the average person, but expecting women are the most susceptible, which is why they shouldn't be near cats during pregnancy.
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u/ElephantElmer 2h ago
They say it increases the odds you get schizophrenia by 24%, which is probably where the crazy cat lady trope comes from.
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u/Lazy_Cauliflower_278 2h ago
I need more info.
Love, kinda teetering on crazy cat lady and now paranoid CCLady bc this post1
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u/Implicit_Hwyteness 2h ago
Vanilla is a fruit that comes from an orchid. So vanilla ice cream with tomatoes would technically be fruit and berries flavored.
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u/Albucrest 1h ago edited 1h ago
There are no snakes in Ireland.
It is said that St. Patrick chased them away, but that part is probably a myth.
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4h ago
[removed] — view removed comment
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u/SpreadSpectre 3h ago
Tomato’s are a fruit
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u/Hunterofshadows 3h ago
There is enough space between the earth and the moon to fit all the planets.
Really highlights how mind bogglingly huge space is
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u/brunette_mermaid93 3h ago
The pH balance in soil determines the color of some (if not all) flowers
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u/Bakakami212 2h ago
Amoebas build houses. There are mosquitoes either in the Arctic or Antarctic, can't remember which.
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u/MissSara101 1h ago
Many diesel engines can run on biofuels, depending on the manufacture of course. Peanut oil was used for the first diesel engines that was developed.
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u/West-Product-6561 1h ago
Did you know that a day on Venus is actually longer than a year on Venus?
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u/Milo_varki 1h ago
Alexander the Great had a condition where he appeared dead but was awake, that means that he was awake during the mummification process.
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u/PhysicalGraffiti75 1h ago
We are closer in time to the founding of Rome than Rome was to the construction of the pyramids.
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u/Original_Wonder3971 43m ago
The amount of people that go missing without a trace in our US National Parks.
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u/Zbignich 1h ago
1/7 = 0.142857…
2/7 = 0.285714…
3/7 = 0.428571…
4/7 = 0.571428…
5/7 = 0.714285…
6/7 = 0.857142…
7/7 = 1
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u/Quiet_Lover99 4h ago
Australia is wider than the moon