Wonders of Water Science Project - Making Clean Water: After learning about pollution and water conservation, you could have your Brownies split into groups and make clean water that has been "polluted" with dirt and other sediments.
This magnet craft can be used to give students a hands-on visual of what is magnetic vs. not magnetic. NYS Common Core Elementary Science Standard Magnetism is a force that may attract or repel certain materials.
Family game nights are popular. But, have you ever thought about changing your family game night to a Family STEM Night? There are plenty of activities that require participants to think like an engineer or a scientist to identify and solve problems.