Shower thought: where do professors get tweed jackets with leather elbow patches anyway? I've never seen them in clothing stores in my life. Is there a specialty retailer just for it? Or do PhDs come with handbooks? Or is it like lightsabers, you have to sew the leather yourself?
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Replying to @gwern
At MIT we made the patches from beaver felt. Felting is an interesting tech; every STEM education should include it.
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