So, when did our ancestors' brains become capable of symbolic thinking, advanced problem solving, and writing song lyrics?

那么，我们祖先的大脑是什么时候开始具备象征性思维、高级问题解决能力，还能写歌词的呢？

It's very hard to use logic and symbolic thinking to have an accurate model of the world.

- 使用逻辑和符号思维来建立准确的世界模型是非常困难的。

Our symbolic thinking, social interactions, technological innovation, and dad jokes just wouldn't be possible without our brain's ability to fancy words together make.

如果我们的大脑不能把单词凑到一起，那么我们的象征性思维，社交互动，技术创新和冷笑话是不可能存在的。