Change is a part of life--people are dynamic by nature. We evolve, for better or worse. The very idea of change often serves as the barometer for how far we've strayed from that high school self we remember, but no longer clearly identify with. No matter how far we stray from that bygone persona, we rarely leave behind many of the natural tendencies that define who we are. The pink hair you sported for your Sweet 16 has given way to a carefully manicured pixie cut, but your laugh hasn't changed. The Camaro IROC-Z may be long gone, but you still reach for your favorite leather jacket. No matter how much we distance or embrace our past, the natural character that defines us rarely departs.