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You might need a stopwatch. How might you estimate your reactions in stopping the stopwatch?
Also, there is a very clear and precise explanation for the lengths of time that elapse before the stars appear.
Reaction Timer Timer
Age 16 to 18
Challenge Level 
You might need a stopwatch. How might you estimate your reactions in stopping the stopwatch?
Also, there is a very clear and precise explanation for the lengths of time that elapse before the stars appear.
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