Kids of all ages love science projects. Even toddlers. Yep, you can start teaching STEM to your kids as young as you want. Toddlers love to explore the world around them. And honestly, this is one of the easiest times to start science activities. You really don’t have to explain much. The goal is simple observation and experience. One-year-olds and two-year-olds love to dig in, get messy, and explore. As a mom, I like to keep things simple and without a giant mess. Oh, and bonus if my preschooler can get in on the fun too. All this can be done. Here are 5 simple sensory STEM activities for toddlers and preschoolers.