His name is Oscar the Grouch, and even people who watched Sesame Street as kids might find him a bit confounding. Why is he green? How did he choose his home? And why’s he in such a bad mood?

They shared45 facts about Sesame Street over the course of the day. Chief among them is the fact that Oscar the Grouch was actually orangefor the entire first season of the show. Orange!

This day celebrates Oscar the Grouch's birthday, the day on which he is the grouchiest. Episode 3,866 of Sesame Street revealed that Oscar's birthday was on June 1, and many characters celebrated ...