[s6e6] The Extract Obliteration -

Penny secretly enrolls in a history class at community college. When Leonard finds her paper on slavery, he rewrites it against her wishes, leading to a conflict about his lack of faith in her abilities.

“The reason Leonard did all of that was because deep down, he was insecure about dating someone who was a waitress/mediocre actress.” Reddit · r/thebigbangtheory · 1 year ago Key Storyline Highlights [S6E6] The Extract Obliteration

Sheldon plays Words with Friends against Stephen Hawking and becomes obsessed with winning, only for Hawking to play a low-scoring word ("act"), leading Sheldon to discover that Hawking is a "sore loser" who intentionally slows down the game when losing. Penny secretly enrolls in a history class at

Fans often debate Leonard's behavior in this episode, specifically his decision to rewrite Penny's paper behind her back. Fans often debate Leonard's behavior in this episode,

Hawking game or perhaps a breakdown of in later seasons?

The irony of the ending is a common talking point; after telling Leonard she wanted to succeed or fail on her own, Penny ultimately has Amy and Bernadette rewrite the paper for her to secure a "B-".