The western hemisphere isn't just the Americas. It includes half of europe...
There are quite a few people in the western hemisphere that don't even bat an eye when they walk past a 1000 year old building on their way to work every day.
For me the oldest building is just a random house from the 13 century.
its a lot more readable if you replace the : with any other function name
define a funktion called fork, which calls itself twice (call once, pipe ( "|" ) the result to the same function again which is run in a new thread in the background ( "&" )). Then call the newly defined function. The : is used to make it look more like emoji.