View source for A Compilation of I-did-not-know-thats (IDNKT)

This list is a collection of discrete pieces of information that it would seem likely for an individual to encounter at some point in a given life span, but for whatever reason the individual did not encounter the information until later in life. These nuggets are as valuable as nuggets of [[Truth]], because they demonstrate how one piece of information can unseat how one understands the world through a faulty assumption or belief system. 

*There once was a woman who thought raisins are, well, dried raisins. She didn't know raisins are dried grapes.
*There once was woman from Texas who didn't realize that Galveston, Texas is an island.
*xing was thought to be a verb, pronounced zing,rather than short for crossing - #605 Kid Logic -this American life 
*There once was a boy who believed that we only have 7 layers of skin. He didn't realize that skin regrows. This boy wore a coat everywhere he went to avoid sunburns which may risk his 7 layers of skin.
*It was once widely held by the scientific community, that there is no such thing as a black swan, until someone found one.
*There once was a man who didn't realize until he was 37 that the multiplication of 9 has a pattern involving addition of the two digits being multiplied to yield the sum of 9.
*There once was a person, about 20 years of age, who didn't realize that thunder comes from lightning. I heard their story on a Facebook group.