If a theory is studied in let's say the 17th century, the theory has had many years to be studied and explained by many different people many different ways.
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I don't do physics , I'm sorry can't help you
Yeah, hand signals are important in officiating games. The hand signals are given by the referee who first signals the fault and then indicates which team has won the point. A point is indicated by one finger at the side of the court to indicate the winner of the rally.
I am going to need a picture for this question