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Quote from Penny in the episode The Holographic Excitation
Penny: So, what are you working on right now?
Leonard: It's actually pretty neat.
Leonard: Yeah. It's a front-projected holographic display combined with laser-based finger tracking. Here, I'll show you. We'll just put this pencil over here.
Penny: Sharp. Thanks to the machine we saw earlier.
This helps us figure out whether you are a human or a cyborg.