Bob the Cartesian Diver
thingiverse
This is Bob. Drop Bob in a bottle of water. Squeeze the capped bottle and Bob will take a dive. Release, and he'll rise. Why? See, Bob has gas. You squeeze the bottle, Bob's bubble shrinks and he sinks. Let go, the bubble grows, and up he goes. **Warning: Adult supervision required! Choking hazard for thirsty kids.** Don't drink Bob's bath water either. eww. Bob is a fun toy, but he's a STEM tool too. See the STEM section below for ideas and questions Cartesian divers are an old idea. See [Wikipedia](https://en.wikipedia.org/wiki/Cartesian_diver) for more detail.
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