"We were pleasantly surprised by how strong and seemingly natural the chimpanzees' attraction to crystals was." ...

"The way they ‘studied' it there, turning it over to observe it from different angles, was amazing." ...

What would a chimpanzee do if you handed it a glittering quartz crystal? Apparently, the same thing many of us would—hold ...

Chimps’ love for crystals could help explain our ancestors’ fascination with the shiny stones. The forerunners of modern humans collected crystals for which they had no apparent use, say scientists.