Presidents and prime ministers as well as foreign ministers and ambassadors from more than 40 countries signed the world's first nuclear weapons ban treaty on Wednesday after it was opened at a ceremony with Japanese atomic bomb survivors and the Mayor of Nagasaki in attendance.The United Nations anticipates that by day's end, the number of countries endorsing the pact could rise to 51.This is the follow-up to the historic adoption of the treaty on July 7, when 122 countries voted in favor of pursuing a nuclear-free world by banning atomic weapons for the first time after decades of proddin…READ FULL ARTICLE