Coffee's enticing aroma is a complex blend of over 800 molecules, including indole, which has an unpleasant fecal scent. Interestingly, people's ability to perceive smells varies significantly due to genetic differences. For example, androstenone, a pig pheromone, can evoke reactions ranging from pleasant woody scents to unpleasant urine-like odors, highlighting how biology shapes our sensory experiences.
