They gave quartz, calcite and other types of crystals to chimpanzees in a rehabilitation center. The apes responded with great interest, and the researchers ended up needing to trade large amounts of ...

Whether you know it or not, you encounter crystals in your everyday life quite regularly. Table salt, sugar and snowflakes are classified as types of crystals, as are many gemstones—including amethyst ...

Observing how chimps interact with crystals may help us understand why our ancestors started collecting them thousands of ...