1721 in science
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The year 1721 in science and technology involved some significant events.
Medicine
- The use of ether is developed as a pain-killer.
- Lady Mary Wortley Montagu introduces the Ottoman Turkish method of inoculation against smallpox – variolation – to London.<ref>Template:Cite book</ref><ref>Template:Cite web Template:ODNBsub</ref><ref>Template:Cite journal</ref><ref>Template:Cite book</ref>
- Thomas Guy founds Guy's Hospital in London to treat "incurables" discharged from St Thomas'.<ref>Template:Cite web</ref>
Psychology
- A suggestion box is developed under the eighth shōgun of Japan, Yoshimune Tokugawa.
Technology
- Richard Newsham of London obtains his first patent for a manual fire pump.
Deaths
- September 11 – Rudolf Jakob Camerarius, German botanist (born 1665)