"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 ...

"If our results are correct, then we have had crystals on our minds for at least 7 million years." ...

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

When caretakers tried to retrieve the crystal from the chimps’ enclosure, they had to exchange it for favoured snacks of bananas and yoghurt. A second experiment showed that the chimps could identify ...

And chimps outperform humans. I once watched Matsuzawa show videos of his experiments with Ai and Ayumu at a conference attended by the world’s leading chimp researchers, including Jane Goodall, ...