On December 3rd:

 1833  Oberlin College Admits Women and Becomes the First Coed College

Oberlin College in Ohio made history on December 3rd, 1833, by becoming the first coeducational college in the United States. It admitted both men and women on equal terms.

 1984  Bhopal Gas Tragedy Unfolds

A tragic industrial disaster occurred on December 3rd, 1984, in Bhopal, India, when toxic gas leaked from a Union Carbide pesticide plant. The Bhopal Gas Tragedy remains one of the world’s worst industrial disasters.

 1967  The First Human Heart Transplant

On this groundbreaking day in 1967, South African surgeon Dr. Christiaan Barnard performed the world’s first successful human heart transplant. The surgery marked a major leap forward in the field of medicine and transplantation.