By the time the genes could evolve a hardwired predilection for making fires and an aversion to performing rain dances, completely different fads could arise and hold sway.

• 等到基因演化出既能模仿生火，又会厌恶跳祈雨舞的硬体性向（脑子里的神经线路），完全不同的时尚可能兴起，再度掌控族群。