We all have at least a few gaps in our knowledge—that’s no secret. That being said, it genuinely feels like there are some core bits of education and fundamental life skills that every grownup should be well-versed in.
Members of the AskReddit subreddit took to a couple of mind-boggling online threads to share the things they’ve personally witnessed other adults not know, from how elementary biology works to how (not) to treat others. Scroll down to read the seemingly common sense things they’ve had to explain to grownups. But be warned, you might want to cringe and facepalm.
- Read More: 45 Times Adults Didn’t Know Very Basic Things And Someone Had To Give Them A Reality Check
#1
Vaccines work
The Human is the cause for extreme climate change
Making better Gun Control Laws will reduce Gun Violence.

Image credits: pizzatimein24h
#2
That Freedom of Speech doesn’t mean you can say whatever you want, without consequences of any kind. It just means the government can’t arrest you for speaking out about the government.

Image credits: TriscuitCracker
#3
That OCD doesn’t mean you like to keep things clean, it means Obsessive Compulsive Disorder. In simple terms it means you have a thing you have to do and if not done it’s like you cannot progress past that point wether it be beeping the microwave a certain amount of times, taking no more or no less than two steps per sidewalk tile or squinting your eyes when you blink. It’s a compulsion thing not a cleanliness thing.

Image credits: Ragingbull444
#4
That I can be a man and be a nurse.

Image credits: jeff_the_nurse
#5
What consent is.

Image credits: razzledazzle626
#6
I once had to explain to a pregnant woman why she shouldn’t smoke…next to a bunch of propane tanks.

Image credits: Pathetian
#7
Not me but my husband. Had to tell his best friend why jumping around in the woods with some deer antlers he had found on his head was a Bad idea. They were hunting.

Image credits: ZubLor
#8
That $2 bills are real, legal US tender.
Got chewed out at a coffee job, for accepting “fake money”, because a customer paid with 2, $2 bills. My boss was in their 40s. Took 10 minutes and a google search to prove I wasn’t lying.

Image credits: DarkFae420
#9
Not me but my father had to do it. Parents were visiting my older brother, his friend was there, he finds out my father is an Engineer. Knows Air Conditioning well etc.
He tells my father, the central air in my house doesn’t work. No matter how much I increase the power, it still doesn’t cool. during winter I keep it at 70, but once summer came I increased it to 80 it still doesn’t work.
My father looks at him… confused… then something clicks.
Slowly, my father replies, “The. Number. You. Are. Changing. Is. NOT. The. Power. It. Is. Temperature. If. You. Want. It. Cooler. You. Will. Have. To. Set. A. Lower. Number.
This was a guy in his late thirties and was an MBA.

Image credits: admadguy
#10
Yelling louder doesn’t make you right it just makes you the loudest monkey with a brain.

Image credits: anon
#11
One day at work, the electricity went out. One of the higher-ups made her way from her dark office to my dark office to ask me to look up something on the computer for her. I said I could look it up when the electricity came back on. She didn’t understand why I couldn’t do it right that second. “Because the computer runs on electricity.”
Not only was that higher-up an adult, but she was highly educated with a Ph.D and everything.

Image credits: twothirtysevenam
#12
I had to explain that bats were a real animal and not a mythical made up creature after telling an ex-girlfriend that I saw one flying above us and she thought I was insane.

Image credits: anon
#13
That my best friend was gonna die if I didn’t take him to the nurse for his epiPen. She didn’t believe in allergies and was a teacher lmao.

Image credits: anon
#14
No, my snake won’t turn into two if you cut him in half.

Image credits: NyalaBoy
#15
That Germany is in Europe.
Then when I was retelling the story later that day, another person was amazed by this tidbit.

Image credits: StrawberryPincushion
#16
My father-in-law asked me if I was born with the genetics to begin life only speaking Spanish when I told him that English wasn’t my 1st language lol
That was a fun conversation to have. Even my mother in law was dumbfounded by his question.

Image credits: Soggy_Willingness_65
#17
Extra alcohol in your drink will cost you extra money. Extra food on the side? Extra money. Why do people not understand you have to pay for things lmao.

Image credits: kay37892
#18
That Hawaii IS a state and that Puerto Rico ISN’T a state, but still a part of the US and it’s people are citizens.
I have also told people who are from Puerto rico that they are US citizens and that is why they don’t need green cards to come to the mainland to visit, work, move, etc.

Image credits: maybe_little_pinch
#19
8% interest rate doesn’t mean you only pay $8 a month in interest.

Image credits: Attarker
#20
That the Moon does not make its own light. It’s actually the sun reflecting off of it.

Image credits: The_Safe_For_Work
#21
That rabbits do not hatch from eggs for Easter like you see on commercials. I have rabbits that I bring places with me, a co- worker asked how big the eggs were? I had to explain that to an adult. My son has a big plastic egg, so as a joke I put a baby rabbit in it and showed him.

Image credits: Cannibal_Cyborg
#22
That ‘simmer’ does not mean leaving the gas on with no flame…. I went to the coffee shop and came back, instantly smelled that my apartment was about to blow up…

Image credits: Boomslang2-1
#23
Personal hygiene and the importance of doing laundry on a regular basis, it was always an awkward conversation.

Image credits: Eli-Aurelius
#24
That Kim Jong Un is not a fictional character.

Image credits: hammetar
#25
When you round numbers you have to round up if the last number is 5 or greater. They would round say $1.99 to $1.

Image credits: Wowpanda42
#26
My parents think it’s racist that they aren’t allowed to say the N word because they are white. Oh boy what a fun convo that was.

Image credits: maddix30
#27
That muslim isn’t a language.

Image credits: DookiesNCream
#28
That Pepsi and Coke are two competing companies, and there isn’t some mega corporate conglomerate that controls all soda.

Image credits: Project_MAW
#29
Why a hot glue gun didn’t work when it was not plugged in.

Image credits: anon
#30
That the noise fly’s make comes from their wings, not their mouths.

Image credits: TheChemicalSophie
#31
Washington the state and Washington DC.

Image credits: Smoochmypie
#32
That the earth does not infact orbit the moon…

Image credits: Lochlore
#33
The little flag on the mailbox in front of your house is to let the mail carrier know there’s outgoing mail. No need to drive to the post office to mail a letter.

Image credits: seektruthbefree
#34
I work for an early intervention program where therapists work with little ones in homes and daycares doing speech therapy, physical therapy, occupational therapy, etc. I had a parent get upset over the phone when I told her her child’s provider cannot come to the home if the child has hand, foot, and mouth disease because it’s contagious and since they visit several homes a day all day and also work with medically fragile kids, they can’t spread illness around. She wasn’t having it. We’ve had providers get URI’s and gastro bugs and spread them around the office because parents don’t let them know they or the kids are sick because they don’t want to cancel appointments.
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