If the space launch last week was interesting to those in your home, this activity might be a fun one. This includes ideas for thinking about what would be needed when building a rover for exploring another planet and then ways to try making a model with things you might have at home.
This activity is a design challenge. The idea is to create spinning toys and test out how well they work. Then revise them or try other things to see if you can make them spin longer or better.
This link includes lots of other interactives for learning about the brain.