What does a pianist look at while playing? Put a pair of eye tracking glasses on a professional while he plays. Then compare to a student.
Pianist eye tracking
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Shifting Incomes for American Jobs
For various occupations, the difference between the person who makes the most and the one who makes the least can be significant.
How Different Income Groups Spend Money
After living expenses, where does the money go, and how does it change when you have more cash available?