Why have humans collected crystals for 780,000 years? Chimpanzees may hold the answer

A new study in Frontiers in Psychology shows chimpanzees have a natural attraction to crystals. Researchers found the animals quickly picked crystals out from ordinary stones. Prof Juan Manuel García-Ruiz said, "We were pleasantly surprised by how strong and seemingly natural the chimpanzees' attraction to crystals was." This suggests deep evolutionary roots.