Quartz crystals are difficult to knap due to size, hardness, and crystalline structure, making them a “low-quality” raw material. However, the Clovis people of North America sometimes made points and… [+6261 chars]Read More
Theia and Earth were neighbors new research suggests Physorg
About 4.5 billion years ago, the most momentous event in the history of Earth occurred: a huge celestial body called Theia collided with the young Earth. How the collision unfolded…
