本套书是根据美国《国家科学教育标准》为中学生编写的科学教材,不仅内容丰富,而且在引领学生探究、启迪学生心智方�

Build 11 machines, includes all the LEGO bricks you need. From the 'practical' (a mechanical hand to pick things up for you) to the intriguing (a machine that m

Notebooking journal for elementary study of human anatomy, written from a Christian perspective.