I made a little something for you guys. :) It's a printable coloring book all about how hearts work. And since sometimes it's not the most convenient thing to print out a miniature book and cut and fold it, I made a video version as well. The whole family helped, so the voices of all 5 of us are in the clip. I hope you enjoy it. A regular paper-sized pdf of the book is attached and here's a link to the video:
Happy Valentine's Day. :)
Update: Blood is never blue! This little video and coloring book were what sparked the "What color is blood REALLY?" video.