Sheldon was in school per usual. But he heard something outside. Looking outside he saw nothing. So he brushes it off. Sheldon goes through school like usual, being smarter than everyone else. Yk, the usual. He tries to make friends, but it's no real use because no normal kid wants to be his friend. But that's okay, but doesn't need friends to be happy. He needs himself and his intellect to be happy.
On his way home on the bus he hears kids being loud and overall making a ruckus. It's annoying but he ignores it to be near his friend Raj, raj is one of his only friends he has in school, Raj is in band. When he gets home he gets off the bus and heads inside his house. He sets his stuff down and goes out to the library.
Once at the library he checks out a book on quantum physics and leaves to sit near the lake and read. A peaceful lake where many people don't go, so he won't be disturbed while he reads.