February 21 – American scientists use a 3D printer to create a living lab-grown ear from collagen and animal ear cell cultures. In the future, it is hoped that similar ears could be grown to order as transplants for human patients suffering from ear trauma or amputation.
August 14 – Following the military coup in Egypt, two anti-coup camps are raided by the security forces, leaving 2,696 dead. The raids were described by Human Rights Watch as "one of the world's largest killings of demonstrators in a single day in recent history".
October 10 – Delegates from some 140 countries and territories sign the Minamata Treaty, a UNEP treaty designed to protect human health and the environment from emissions and releases of mercury and mercury compounds.