21) Who is Penny's last name?
22) Who plays the character Howard Wolowitz?
23) In what year was the Big Bang Theory first aired?
24) What is Raj's last name?
25) In what city does the show take place?
26) Who plays Bernadette Rostenkowski-Wolowitz?
27) What university did Sheldon and Leonard attend?
28) Who plays Sheldon Cooper?
29) What is Stuart's last name?
30) What was the name of Penny's ex-boyfriend from the first season?