In 15 years, electronics has leaped from the vacuum tube to the transistor to the maser and laser. In less than a generation, aircraft engineering has jumped from piston to jet to rocket and next to nuclear propulsion. So fast is all technology moving these days that by one estimate new engineering graduates can expect a professional "half life" of only about ten years. Half of what they now know will be obsolete in 1973, and only half of what they will need to know is available to them at this time.
Aging young engineers obviously need a depletion allowance...
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