On June 4, the Chinese government forcibly suppressed pro-democracy protests in Tiananmen Square, resulting in a tragic loss of life and a significant impact on China's political landscape.

The first ever 'World Environment Day' was celebrated on June 4, 1976, initiated by the United Nations to encourage worldwide awareness and action for the protection of the environment.

On June 4, 1969, the first major use of a digital computer to help with a scientific study was reported, marking a significant advancement in the field of computer science.