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When did he discovered? Do you mean what? He discovered Yellow Fever was transmitted by mosquitoes. And if you mean when did he discover it, then the answer you are looking for is he led a research team that discovered this in 1900.
935 is the purity for Argentium silver. Argentium silver is NOT sterling silver. It is a different alloy which has germanium in it which makes it less prone to tarnishing. Sterling is an alloy that has more copper in it. The copper is added to fine silver in order to make it stronger.
J.J.Thomson has discovered the electron in 1897
It is not known where exactly in England sodium was discovered. It was discovered by Sir Humphrey Davy in 1807.
Alexander Fleming discovered penicillin in 1928