The Ningxia Museum of Science and Technology is Yinchuan's main hands-on science venue, aimed especially at families, school groups, and curious children. Exhibits cover physics, technology, space, and regional science education in a way that offers a change from temples, pagodas, and imperial tombs.
For foreign travellers, the language barrier may limit some displays, but the interactive format still makes it usable. It is most worthwhile if you are travelling with children or have extra time in central Yinchuan. Check current hours locally, as institutional websites in China can be hard to interpret from abroad.