A set of out of the box "conductive/insulation experience boxes" to help students establish the concept of "conductor semiconductor insulator" in an intuitive, safe, and reproducible way, and gain a preliminary understanding of the differences in electrical resistivity. Experimental project: Clamp 20 samples between crocodile clips in sequence, record the LED on/off, and complete the "conductive/non-conductive" table. Semiconductor characteristics: Use photoresistors to block/illuminate and observe changes in LED brightness; Reverse the LED connection to verify unidirectional conductivity.. Creative Challenge: Students bring their own can rings, fruits, coins, etc., and test and explain the phenomenon on site.