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Use a mixture of common sense and mathematics.
Don't forget that risk is a personal preference -- you cannot be 'wrong' if you choose to accept a certain level of risk in an activity (although you might be foolish; but that's a different matter!)
Discussing Risk and Reward
Age 16 to 18
Challenge Level 
Use a mixture of common sense and mathematics.
Don't forget that risk is a personal preference -- you cannot be 'wrong' if you choose to accept a certain level of risk in an activity (although you might be foolish; but that's a different matter!)
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History of Morse
This short article gives an outline of the origins of Morse code and its inventor and how the frequency of letters is reflected in the code they were given.
