https://en.wikipedia.org/wiki/Sight_(device)
https://en.wikipedia.org/wiki/Telescopic_sight
https://en.wikipedia.org/wiki/Bow_and_arrow#History
https://en.wikipedia.org/wiki/Ranged_weapon
https://en.wikipedia.org/wiki/William_Gascoigne_(scientist)
https://www.readex.com/blog/little-murder-telescopic-rifle-sights-alter-course-american-civil-war
https://www.warhistoryonline.com/guest-bloggers/brief-history-rifle-optics-united-states.html?chrome=1
https://en.wikipedia.org/wiki/Carlos_Hathcock