90: If a person's right thumb is crooked, they are likely to play a woodwind instrument like clarinet or saxophone.
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76b: 2nd: How they move their hands when they are talking. Martial artists have thumbs slightly tucked in towards the palm, the fingers never really straight, and will have a slight bend in the middle knuckles.
64: String players have longer fingers on their left hand, and their left fingertips are usually calloused and/or harder than their right. Cellists may have a callous on the outside of their left thumb due to playing in thumb position.