Children work together
to find the center of mass of various objects. Photo: Reidar Hahn
Children work together
to find the center of mass of various objects. Photo: Reidar Hahn
February 15, 2017
Children work together
to find the center of mass of various objects. Photo: Reidar Hahn
Children work together
to find the center of mass of various objects. Photo: Reidar Hahn