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Sheldon: I notice you're using titanium. Did you give any consideration to carbon nanotubes? They're lighter, cheaper, and have twice the tensile strength.
Wolowitz: Sheldon, there is a diploma in my office that says I have a masters in engineering.
Sheldon: And you also have a note from your mother that says, "I love you, bubulah," but neither of those is a cogent argument for titanium over nanotubes