From the website: Participate in additional hands-on creating and making activities in the galleries.  

During our recurring Play. Tinker. Make. events, the Science Museum invites you to use an assortment of materials, tools, and technologies to explore and create. Our design- and play-based activities are experimental, fun, and intended to create opportunities for open-ended exploration. You’ll play, tinker, and make your way to science inspiration!

This event is free with museum admission.