Primates of all stripes really love their crystals. Archeologists have found the shiny rocks at dig sites dating back as long as 780,000 years ago. Although, we are still not sure if our ancestors ...
In experiment 1, the crystal was placed on a pedestal which had been installed months prior to the experiments, so it did not constitute a novelty for the chimpanzees.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results