MR / Schenectady,NY.Yates Arts-in-Education Magnet School, urban public school, Grade 3.Teacher explains concept of "grid" while teaching .social studies lesson on latitude and longitude using manipulative materials. (Students will draw latitude and longitude lines on the grapefruits).Class includes several mainstreamed students with special needs..MR: L-C-3; Hu1.©Ellen B. Senisi