What charge card, developed in 1950, was the first to be approved nationally in the US?
The card was established by Frank McNamara and Ralph Schneider.
Who discovered Insulin?
Who invented the hot air balloon?
Who invented the thermos flask?
Who invented radar?
Who discovered electron?
Edward Jenner discovered vaccine for which of the following disease?
Who developed the theory of relativity?
Who invented the Centigrade scale?
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