As clever as we might think we are, we all have gaps in our knowledge. After all, it’s impossible to know everything about our world. You might live your whole life believing that dolphins are land mammals who swim just for fun. Or assuming that a "birthday suit" is a specific set of clothes people wear when they turn another year older. Then, when someone points out that it's completely not true, you can’t help but wonder whether others thought the same as you.
Well, negan2018's post on Ask Reddit revealed that there are plenty of people who have also experienced these embarrassing moments. The user asked fellow community members, "What really obvious thing have you only just realized?" and thousands started sharing their stories.
As they say, the more you read, the more you know. So get ready to take a deep dive into some of the best answers we have collected from this thread. Make sure to upvote the ones you enjoyed most and share your own little misunderstandings in the comments below!

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The houses in Bikini Bottom are car mufflers...
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Image credits: hi_its_lizzy616