Popsugar Family Kid Activities Valentine's Day Experiments to Do With Kids 7 Valentine's Day Experiments That Will Make Your Child Fall in Love With Science February 3, 2017 by Alessia Santoro View On One Page Photo 1 of 7 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Invisible Ink Message With a little bit of lemon juice, a Q-tip, and a white piece of paper, your little can create a message for a secret admirer. Previous Next Start Slideshow Kid ActivitiesValentine's DayScience NewsStem