A violinist's fingers
The hypothesis that violinists have longer fingers on their left hands, while non-violinists have shorter left hand fingers, is proven to be true.
Bones are a vital part of our body for many reasons. Involvement in sports and activities that result in stress on our bones, like baseball or playing musical instruments, are believed to increase the length and size of our bones.
What would happen if the science project was repeated by comparing the finger length of musicians who play other instruments like the guitar or piano?
Try repeating this science project by measuring the arm length of baseball pitchers.
Bone lengthening in response to stress - http://thequestforheight.blogspot.com/2010/04/bone-lengthening-in-response-to-stress.html
Do string players have longer left fingers? - http://www.sciencebuddies.org/science-fair-projects/project_ideas/Music_p014.shtml
Basic bone biology - http://www.iofbonehealth.org/health-professionals/about-osteoporosis/basic-bone-biology.html