All-TIME 100 Gadgets
TIME technology editor Peter Ha picks the 100 greatest and most influential gadgets from 1923 to the present
Originally devised on a ski track in Finland in 1975 to aid the national cross-country team, the heart-rate monitor went wireless in 1983. Since then it has changed how athletes train by giving other pertinent data, such as calories burned or average heart rate over a certain amount of time.
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