PBS Kids ZOOM conducted an experiment to see if gender or age effects body shape. Measure your height (the distance from your head to your toes) and your arm span (the distance from the longest finger on your left hand to the longest finger on your right hand). If your height and arm span are about the same, then you're a square. If they're different, you're a rectangle.
Make it an experiment! Graph how many kids are squares vs. rectangles. Does gender make a difference, or age?