Gravity? Center of gravity? Pivot?

The 3rd and 4th graders made balance dragonflies.

The finished balance dragonfly looks like it might all, but it's stable because its wings are in front.

What is a sink-and-float?

The 5th and 6th graders make an aquarium by floating sink-and-float in a plastic bottle.

The sink-and-float is a soy sauce dispenser

We'll add color

We'll decorate the plastic bottle and complete our original aquarium!