i also hope my kids better understand themselves and the world in which they live and are better prepared to interact with their world. if you miss one there is always an opportunity to go back and get another. if you receive a live vaccine, you may get the infection the vaccine was meant to prevent. they are mostly invisible even when eating or talking. i know you can do it because i did. cans of drink can also be useful as these can be used for cooling wrists before they are opened. 