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In the 21st century, the real issue isn’t “How do you find information?” but “How do you sift through the oceans of data out there?” As a result, it can be hard to actually know what is “common knowledge” and what is some obscure factoid you have randomly memorized. 

Someone asked “What’s something you thought was common knowledge but found out most people didn’t know” and netizens shared their best examples. From intricate traffic rules to observations about human behavior, hopefully, you will learn something new. So get comfortable as you scroll through, upvote your favorite examples, and comment your ideas below. 

#1

If you flick the bar sticking out of your steering wheel up, it causes the lights on the right side of your vehicle to flash. And if you flick it down, the left side flashes, so people know you are going to make a turn or change lanes. It even works in pickup trucks!

EkbyBjarnum Report

#2

Queer people existed in the "olden times". And they exist in countries where it's banned. And they exist in ultra-conservative families.

PrecariousThings Report

#3

Social media is NOT for you, it's for advertisers. You're the product.

blaspheminCapn Report

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Luke Branwen
Community Member
11 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Except Tumblr. It has already cost a large company billions of dollars and is somehow still running.

Kira Okah
Community Member
11 months ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

The thing about Tumblr is that companies keep withdrawing ads on there, thinking that they are not getting traffic from there because it doesn't show up on their metrics. But all outgoing links on Tumblr run through a hidden referrer link (href.li), so all traffic is anonymous and doesn't show on tracking metrics. It's brilliant.

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Bouche and Audi and Shyla, Oh My!
Community Member
11 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Of course we're the product. Audi and I are the two most famous and adorable cats on all of Bored Panda! We are always the product. You're welcome, soft can-openers.

David
Community Member
11 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

LOL at seeing comments like this posted on social media sites. Both user and provider benefit from the arrangement and if you disagree - stop posting.

Rinso the Red
Community Member
11 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

In general, if they're offering a "free" service, you are the product.

DrBronxx
Community Member
11 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

While I agree that we are the product, just because it's for advertisers doesn't mean it's not for us. It's not a binary thing.

Becky Samuel
Community Member
11 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

How brainwashed do you need to be to think that it's okay for a corporation to know everything from your sexuality, your purchases, your geographical position, your political opinions etc?

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#4

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge You let people out before entering

Maybeyanny , Darius Krause Report

#5

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Being nice and patient will give you a bigger chance of getting a refund or a new of whatever is broken, than being angry and blaming the random worker

ellaablair , Clay Banks Report

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#6

You have to empty the lint trap on your dryer after each load.

SummerGirlsByLFO1999 Report

#7

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge If you are driving and it is raining - turn your lights on.

broncoguy612 , Thái An Report

#8

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge That you should wash your hands every time you use the toilet. Yes, even if you “got nothing on them”.

Ecstatic-Barracuda20 , Clay Banks Report

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#9

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge HR is there to protect the employer, NOT you.

Grenadine is made from pomegranate, not cherry.

rayyy16 , im Gouw Report

#10

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Gambling at a casino will most likely result in losing money.

Layla_BC , Kaysha Report

#11

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge The older I get, the more I'm realizing basic history is not known at all.

Yanwes , Zach Plank Report

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#12

RSVP means Please Respond. Not respond if you're coming, or respond if you're not coming. Respond whether you're coming or not.

EstablishmentLucky50 Report

#13

Vehicles entering a freeway/merging with traffic do not have the right-of-way and YIELD signs are not merely suggestions.

No_Independence1479 Report

#14

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Ammonia + Bleach = Poison Gas. Don't combine the two, and pay attention to the active ingredients on cleaning products. Glass cleaner is often ammonia-based while "bathroom cleaners" usually contain bleach, for example.

paleo2002 , Kelly Sikkema Report

#15

95% of getting what you want, is in HOW YOU ASK.

Don't be a d**k/karen, and you will likely get whatever you need.

PitBullFan Report

#16

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Cows have to give birth first before they can produce milk
Just like any other mammal

schlingelschlange , Suvrajit 💭 S Report

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#17

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Lefty loosy, righty tighty

BubblesO4 , Christian Buehner Report

#18

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Mayonnaise does not have any dairy in it. Just because eggs are sold in the 'dairy' section of the grocery store does not mean eggs are dairy products. They will not trigger your lactose intolerance because they have no lactose in them.

WesleySmusher , Jaye Haych Report

#19

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge If the traffic lights are out at an intersection, treat it as a 4 way stop.

porcelainvacation , Davis Sánchez Report

#20

If interrogated by the police for a crime ask for a lawyer and say nothing. You can be incredibly guilty but without your testimony you have a chance to get off. You have rights.

df_45 Report

#21

I have an inner monologue which I thought everyone had

SL04NY Report

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#22

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge You wash out blood with cold water

Complikatee , engin akyurt Report

#23

It's YIN and Yang, not YING!

Rich-Blacksmith6672 Report

#24

Some eggs aren't fertilized and will never become a baby/chicken/penquin. It baffles me how many folks Ive had to explain that to this month alone.

ScreamingMoths Report

#25

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Blue light on your dash means your brights are on

Car_loapher , Hannes Egler Report

#26

I'm always surprised by the number of people who think that ponies are *baby* horses rather than *small* horses.

TheMightyGoatMan Report

#27

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge A lot of media online. It's easy to see something being really popular online and forget that it's only popular amongst people of a certain demographic or audience.

The_One_Guy1 , dole777 Report

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#28

Roman Numerals.

Not sure why I thought it was common knowledge.

Arkiswatching Report

#29

If you want to drink beer all night long, drink a glass of water between each beer. You will be the last one standing.

scrimage Report

#30

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge The arrow next to your gas pump symbol on your dashboard indicates what side of the car your tank is on. ⛽️🚗

Iwantacheezeburger84 , Danny Sleeuwenhoek Report

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#31

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Police are allowed to lie to you, manipulate you and twist your words during interrogations. Most people assume there's some kind of rule in place but once you waive your right to an attorney and agree to talk they can basically do whatever they want short of a threat. Innocent or not, always, always lawyer up immediately.

Lordfuton92 , LOGAN WEAVER | @LGNWVR Report

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#32

That you could just remove all the zeros from a multiplication question, multiply all the non zero numbers, then just add the zeros back afterwards.

E.g. 234000 × 6000 could be done as just 234 × 6 first, which is 1404, and then since there are 6 zeros in total from the original two numbers, just add 6 zeros to the back of 1404. Then you have 1404000000.

Very easy.

olmepha Report

#33

In the US, even numbered highways go east and west whereas odd numbered highways go north and south.

k_marts Report

#34

Capybaras are the worlds largest rodent. I guess not everyone grew up with The Wild Thornberries

FroggiJoy87 Report

#35

Many people can't picture faces in their heads, even of their loved ones. We don't fully remember faces but recognize them.
I can tell you a few things about my mother's face, but I don't have a picture of it in my head.
I am very fascinated by people who can do it though.

Neo_bow Report

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#36

If you go under a tunnel in the states, if there is a red line along the wall it means your under ground and if it’s blue you’re under water.

Wide-Ad346 Report

#37

If your birthday is on a Monday, then the next year it will be on a Tuesday, then on a Wednesday and so on with the exception of leap years where it skips a day.

InviteAromatic6124 Report

#38

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge Pressing the “TEST” button on a smoke detector will silence it.

I still see people fanning towels at them sometimes.

darknecross , Wikipedia Report

#39

That the Alphabet Song is just "Twinkle Twinkle Little Star" in disguise.

_TwentyThree_ Report

#40

Some people confuse the concepts of "checking your oil level" with "changing your oil periodically". Both activities need to be done regularly.

As in "why would I need to change the oil? The light hasn't come on yet!"

casapulapula Report

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#41

Knocking on a door before going inside

hajoonxx Report

#42

This may just be a local thing but here goes. The reflectors in the roadway at night are white when you’re going the right way, and red when you’re not. Specifically it’s the reflectors that divide traffic lanes (white dashed lines).

XxDrummerChrisX Report

#43

“Lefty Loosy, Righty Tighty”: 30 Highly Useful Facts That Are Not Yet Universal Knowledge In the US, a lot of hospital systems have financial aid based on income. I've gotten 60-100% of my bill wiped *after* insurance. Even while making a living wage, they still took off 60%.

272027 , Adhy Savala Report

#44

How to read a map. General directions. NEWS. Sometimes there's no wifi and apparently, no common sense.

cre8magic Report

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