On this day in 1967, a South African transplant team headed by Christiaan Barnard carried out the first heart transplant on a human
On this day in 1984, a chemical leak from a Union Carbide pesticide plant in Bhopal, India, killed more than 3,800 people and injured as many as 600,000 others
On this day in 1997, 121 countries signed the Ottawa Treaty prohibiting the manufacture and deployment of anti-personnel landmines.