 So we built a simplified robot that mimics the belly crawling of an infant. So as the baby is crawling, the hands are stopping on the carpet and the torso and legs are sliding along the carpet. And what ends up happening is that those contacts between the infant and the carpet generate different removal forces on that act on these deposited particles. So these removal forces could be aerodynamic stresses, so lift and drag. It could be electrostatic refulsion. It could be vibrational forces and all these forces act to detach that particle from the carpet fiber, release it into the air. That's something that has never been studied for an infant. Essentially that's what was simulated with the robot and it's something that's very unique. So the movement dynamics of a crawling baby are different than that of adult that's walking across the carpet.