I tell my mom that if you take a color wheel and spin it fast enough, it goes white.

I tell her that white light is made up of other colors.

I tell her that if your computer screen is white and you shake your head you can see the different colors.

Does she believe me? No.

Then I get a "Ask A Science Teacher" book for Christmas and show her.

Does she believe me now? No.

Does she believe the book? Yes.