>> maeve. >> go ahead. >> pour that in. >> do it, maeve. >> stick your hands in there and given us our like that. >> so we are making what's called a polymer. we interact with polymers every day. there are polymers in your hair, in your cell phone, everywhere. >> take us to the last one. >> our last one is very cool. this may look like magic, but it teaches an important scientific principle. take a look. do you see the pyrex in the oil? >> yes. >> you're not supposed to. you don't see it in the oil. it disappeared. >> you're right. you don't see it. >> no i don't. you're right. >> you don't see it in the oil because these two materials bend light in different angles. this is called the refractive index when the light hits the rod in the oil it gives this disappearing effect. >> what is your name? >> alexa. >> everyone did such a great job. thank you, guys. >> we'll be back with drinking. but first this is "today" on nbc. we know a place where tossing and turning have given way to sleeping. where sleepless nights yield to restful sleep. and lunesta can help you get there, like it has fo

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