Thursday's TV Highlights: 'Mom' on CBS
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The Big Bang Theory Wolowitz and Koothrappali (Simon Helberg, Kunal Nayyar) help Sheldon (Jim Parsons) with an online ad to find a girlfriend, while Amy (Mayim Bialik) is secretive about whom she is dating now in this new episode. 8 p.m. CBS
The Vampire Diaries Lily's (Annie Wersching) former...