A modular STEM teaching tool for children that condenses the four major knowledge areas of physics, energy, mechanics, and programming into one infinitely expandable building block system. Children do not need tools, they can complete disassembly and assembly in 3 seconds with only magnetic buckles, and create 60+scientific models such as windmill power plants, solar powered cars, hydraulic lifting bridges, etc. in one class. 1 set of building blocks=physics experiment box+energy science popularization kit+robot entry-level platform. Children's computational thinking and engineering literacy can be cultivated through a closed loop of "problem discovery modeling verification optimization iteration".