Interesting anecdote. I'm a European-American; members of my family and I have all seen scorpions in Spain, Italy, and especially Greece - all you need to do is stroll through a village at night. As for the US, I've never seen one outside a terrarium.
Anecdotal, but I grew up in the US and I learned this in middle school as a gifted student. Others have mentioned it depends on the state/curriculum. I imagine in other countries they also divide their students between standard/honors/gifted-type tiers; they certainly do in the Netherlands, which is where I did my graduate studies.
I'm an American, and I too know the difference between cottage and Shepherd's pie. Some people never leave their small towns and assume their experience and limited knowledge is universal.
Party's here!