The chimpanzees began picking crystals from ordinary rocks and taking them to their beds until the researchers realized they could not return them empty-handed.
Our preferences are ingrained traits that have developed over time. We are learning about our closest cousins to better understand ourselves. A recent article described how chimpanzees prefer crystals to ordinary rocks. But science has struggled to understand why, until now. By studying chimpanzees and monkeys, we reveal a few secrets about ourselves. What makes … Read more