Yeah, my first thought was, let’s not turn this into a “shake our heads about the young people” thread.
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Or into a thread about the Masters
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I don’t know if this would be under the category common knowledge or etiquette, but as a frequent flyer, I am surprised by people at the back of the plane who think they can rush down the aisle when it’s time to leave the plane and don’t understand that you have to wait your turn.
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I figured it was common knowledge that 3 teaspoons =1 tablespoon, but I have met a number of people in my lifetime who did not know that.
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Google says you are right but I swear I was taught 2.5.
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Apparently your teacher didn’t read from the Book of Common Knowledge. 
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How to use chopsticks is common knowledge around here (including by those whose ethnic background does not have a tradition of using them), but is apparently not so common in other places in the US.
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I can’t use them. I’ve tried. My 5 year old GD can, though. 
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Astronomical stuff, like the distance to Alpha Centauri.
The type and age of rocks on which one might live.
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…that Notre Dame has a football team ?
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Sounds like a nice thing to do if he wasn’t interested in it. I certainly would do the same.
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When my kids were little, I’d help them out by addressing thank you notes for them, until I realized they needed to learn!
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My kids thought it was handy downs too, I never corrected them. Once I took my 16 year old to the podiatrist (dancer), by that age they were responsible to fill out medical forms. I asked my daughter what she was going to say about her injury, she relied that her thumb toe really hurt and was swollen. I admit I hesitated before breaking the news that not everyone referred to that toe as a thumb toe.
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After I have been in to NYC for the first time, I knew Fifth Ave divided East and West side of NYC. I was surprised when I had to explain to some friends from NJ how the streets worked in NYC. Those people have come in and out of NyC.
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A valid distinction. I can’t change a tire.
I need to look into this book. I’m wondering if it’s one we used to have. If not that one, it was likely something similar. Categorized by topics - history, science, art, etc
Over the recent holiday, I met a man from Manhattan who makes fried green tomatoes (Dan Qualye anyone). Who knew that folks in NYC were cultured ?!!!
I just learned that “quarter round” isn’t “cord around” … and that shoe molding is a different shape.
My kids always were confused by the ‘no tailgating’ sign on the roads. Because why would someone set up a tailgate (ie. football tailgate) on the side of a road???
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Okay, it was a book by E.D. Hirsch, Jr.
The New Dictionary of Cultural Literacy - What Every American Needs to Know
I must have purged it somewhere along the way. The one we had was published in 2002. Doesn’t appear to be a more recent version.
I see another entitled, An Incomplete Education.
Also, so years old.
I suppose Google replaces the need for such books, but having a collection of various topics seems handy.
My cousin always says, “Chester drawers,” instead of, “chest of drawers.”
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I was today years old when I learned 3 teaspoons = 1 tablespoon! 
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