Vulcanization process: 3,500 years old technology

Discover how more than 3,500 years ago, the Olmecs used a process similar to vulcanization to create rubber balls for ball games and other utensils.

Vulcanization process: 3,500 years old technology
Technology from 3,500 years ago: vulcanization process. Image by Wanthana Manotorn from Pixabay