The Sunflower/Girasol program is a Spanish/English bilingual science discovery program for Hispanic children in grades 2-6, designed to improve science instruction and educational opportunity for this group. The report describes the program's proposed activities and products, progress to date, and results of an evaluation of the first two units of the curriculum, on plants and water. The units were field tested in 1996 in 120 bilingual and mainstream grade 1-5 classrooms in six states and Puerto Rico. Results indicate enthusiasm on the part of teachers, and increased student interest and motivation. Most of the participating teachers had no training in use of the materials but found the activities easy to implement. A year later, a more controlled evaluation was conducted in four schools, in grades 3 and 4, with control groups using commercially available curricula. Results of this second evaluation were found to support the efficacy of the Sunflower/Girasol science curriculum model. (MSE)