Science and Technology Index
The Middle Paleolithic, approximately 300,000 years ago, saw the introduction of the prepared-core technique, where multiple blades could be rapidly formed from a single core stone. The Upper Paleolithic, beginning approximately 40,000 years ago, saw the introduction of pressure flaking, where a wood, bone, or antler punch could be used to shape a stone very finely. By the mid-twentieth century, humans had achieved a mastery of technology sufficient to leave the surface of the Earth for the first time and explore space. At the same time, this new technology replaced other medical devices and could thereby …