There are lots of interesting things that we have due to evolution. Like mitochondria. They were originally parasites who developed a symbiotic relationship with us. Let's not forget our opposable thumbs, which many of us now use for microscopic keyboards on cell phones and little else. But I'm still trying to crack the puzzle behind dandruff. It doesn't serve a purpose, yet those of us with hair are often stuck with it. Did our ancestors have to deal with it? Is that what chimps and apes go digging for on each other? Must Adam Lambert be stuck in my brain?