The Big Bang Theory ran for a full 12 seasons as a mega-popular sitcom, and in that time, it explored plenty of engaging, hilarious and often heartfelt ideas. The show gave the main characters a chance to grow up while still retaining their brilliant and geeky side, and plenty of side characters had compelling arcs, too. The Big Bang Theory also left some intriguing ideas on the table, however, or didn't explore some of its beset ideas deeply enough.
Source：https://www.cbr.com/the-big-bang-theory-best-ideas/
