Abstract: The microgravity experiments "Saturday Morning Science'' carried by Don Pettit, senior science astronaut, in 2003 on International Space Station was introduced in the present paper. The experiments video which has become available on NASA website demonstrates a variety of surprising phenomena which are highly related to the basic sciences in fluid convection, mechanics, crystallography, kinematics and so on. The experiments include 14 fluid experiments and 7 mechanical experiments. Only fluid experiments were narrated in this paper, particularly "Marangoni convection'' and "thin film crystallizer'' were compared with their counterparts on ground and the effects of microgravity on relevant phenomena were analyzed.