Resources
Many science/engineering activities can be found at these websites:
https://discovere.org/engineering-activities/
https://www.jpl.nasa.gov/edu/resources/
Some specific activities that are easier to do at home:
https://discovere.org/engineering-activities/water-pollution-cleanup/
https://discovere.org/engineering-activities/build_a_bridge/
https://discovere.org/engineering-activities/make-your-own-seismograph/
https://discovere.org/engineering-activities/hoop-glider/
https://discovere.org/engineering-activities/critical-load/
https://discovere.org/engineering-activities/slinky-science/
https://www.jpl.nasa.gov/edu/resources/lesson-plan/touchdown/
https://www.jpl.nasa.gov/edu/resources/lesson-plan/design-an-alien/
https://www.jpl.nasa.gov/edu/resources/lesson-plan/on-target/
https://www.jpl.nasa.gov/edu/resources/lesson-plan/make-a-cardboard-rover/