Nitrous Oxide:
1800-Sir Humphrey Davy, Discovered that inhaling Nitrous Oxide relieved the pain of toothache. He published his findings in a book, but due to it's unusual title, his discovery went un-noticed.
1845-Horace Wells, Realised potential of Nitrous Oxide after seeing it being used in the theatre. When Wells tried demonstrating the use of it at Massachussetts General Hospital the patient groaned during the removal of a tooth, so he was labelled a fraud.
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