The ground-breaking Treaty on the Prohibition of Nuclear Weapons (TPNW) enters into force today, January 22. The TPNW bans any country party to the treaty from developing, testing, producing, acquiring, possessing, stockpiling, using or threatening to use nuclear weapons, effectively and permanently stigmatizing nuclear weapons. The treaty also prohibits countries party to it from allowing any stationing, installation or deployment of any nuclear weapons or other nuclear explosive devices in its territory or at any place under its jurisdiction or control. The Nobel Peace Prize Award-winning network, ICAN, has produced a handbook explaining how the TPNW works. Countless organizations around the world are holding celebratory events to mark the banning of the bomb.