I used to take care of my boss's kid and she's a dentist already. I remember that she's talking about these stuffs and it amazes me. Since Im woking when she was trying to discuss about it, it didnt really sunk in with me the wonders of it. Though it might be invisible to the naked eye, humans has the ability to find ways. Thank you for sharing these, ill make sure to show it to my boss's daughter.Shell definitely love it.