Test out chemical reactions with children by mixing baking powder and vinegar for a small explosion, or combining corn starch and water to make slime. Mixing food coloring colors and playing with the texture of paint is also a good way for children to explore.
Bath time can easily turn into some active and engaging science time. Discuss the basic properties of water with kids. What happens to the water level when you fill a tub and then get in? What happens to some of that water if you freeze or heat it? These are all questions that can be explored in the tub.
Going outside allows children to experience the natural world of animals and plants. Parks are loaded with earth and environmental science resources. Pack a magnifying glass so kids can catch insects and observe — up close — how they function.