STEM Challenge: Can you build a flotation device for an action figure? from More Than a Worksheet. Guide your students through the entire STEM engineering process with a simple trifold. Teach about buoyancy and density while learning the design process.
Ed Dancing raisins activities. Lots of fun experiments. I have done this experiment, and seen the entire class become silent out of curiosity. It is a great engagement piece for a lesson, and it can be hands on if you ask for volunteers!