1000 years ago saw the use of gunpowder in combat [0], the Norman conquest of England [1], and the invention of paper money [2]. Assuming you're not going to s

1000 years ago saw the use of gunpowder in combat [0], the Norman conquest of England [1], and the invention of paper money [2]. Assuming you're not going to start a war or a religion, what kind of weapon or financial innovation could you invent that will change the world in a millennium? [0] https://en.wikipedia.org/wiki/History_of_gunpowder#Gunpowder_Age https://en.wikipedia.org/wiki/History_of_gunpowder#Gunpowder... [1] https://en.wikipedia.org/wiki/Norman_conquest_of_England https://en.wikipedia.org/wiki/Norman_conquest_of_England [2] https://en.wikipedia.org/wiki/Banknote#Early_Chinese_paper_money https://en.wikipedia.org/wiki/Banknote#Early_Chinese_paper_m...