Surprisingly few people know about the historic event at the UN on 7 July 2017. A Treaty on the Prohibition of Nuclear Weapons was approved by 122 member states. On 20 September the treaty opened for signatures and so far 53 countries have signed and three have ratified it – the Holy See, Guyana and Thailand. The treaty becomes international law 90 days after 50 states ratify it. The hard work begins now, and the TRANSCEND community has a specific and necessary contribution to make.