In the 1700s,who would pay the postage fee for letters before the stamp was invented?
Later in 1840, Rowland Hill invented the stamp, which was paid for by the sender, not the receiver.
Who invented the vacuum pump?
Who invented bluetooth?
Who discovered the colour photography?
Who invented the electrocardiogram (ECG)?
Who discovered Sodium?
Who invented the waterproof raincoat?
Who discovered Penicillin?
Who discovered electricity and invented the lightning rod and bifocals?
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