Make a balloon powered car using a small box (like a pop tart box). This hands-on science activity would pair well with any car book - like Galimoto by Karen Williams, My Car by Byran Barton, or Mr. Gumpy's Motor Car by John Burningham.
Self-inflating Balloon Science Experiment - Halloween Activity for Kids
I've been thinking about this for quite some time and we finally made it today - translucent silly putty. I wasn't sure if it would work, so we made a small batch. It worked and was really cool on the light panel (which is where it was intended t