boats

Paper boats:

@http://wondertime.go.com/create-and-play/article/fold-a-paper-boat.html @http://www.wikihow.com/Make-a-Paper-Boat @http://www.ehow.com/how_2000722_make-paper-boat.html

Clay boats: http://www.wikihow.com/Make-a-Boat-out-of-Clay http://www.education.com/activity/article/Clay_Boat_fourth/

teacher's reference: @http://teachers.egfi-k12.org/17/ @http://cpet.ufl.edu/BestPractices/PDF/Physical%20Science/Properties%20of%20Matter/Density%20and%20water%20displacement%20explored%20with%20clay%20boats%20that%20students%20design%20and%20create%20then%20test.pdf