Cosmetics aren't just for enhancing beauty; they've also played a role in health and science. For instance, lipstick was once used to indicate temperature changes, known as "mood lipstick," which reacts to skin's pH levels. Additionally, some mascaras contain peptides that can promote lash growth, blurring the line between makeup and skincare. This demonstrates the evolving innovation in cosmetic formulations, where products serve multiple purposes. Do you know any other fascinating ways cosmetics crossover with health or technology? Share your insights!