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1806 – Future U.S. President Andrew Jackson kills Charles Dickinson in a duel. Jackson will fight over 100 duels, many to protect his wife’s honor. 1842 – John Francis attempts to murder Queen Victoria as she is driven through London Hill with Prince Albert. More at: History

One of the earliest texts on the human eye was written in the ninth century by Arab doctor Hunyan ibn Ishaq (809-873 CE). According to him, how did the eye function?