text:  Don't go anywhere because you're about to go back thousands of years to ancient Mesopotamia as we find out how the very first chemist created the perfect perfume. And how does your phone's touchscreen know when you're actually touching the screen? And when you have a song stuck on repeat, what's the best way to clear that mental playlist? Spoiler, it's a lot more delicious than you might think. That's all coming up on Unexpected Elements after this.