Soap bubbles are hollow balls of soapy water filled ... then pouring the water in the sink. Help your child conduct a simple experiment. Try making the bubble solution from the first two ...

If you keep a freshwater aquarium or freshwater shrimps, then you may be familiar with those personable green velvety balls that are ... float in the daytime and sink at night?

The gentle flows around the sink end up encouraging the water to swirl one way or the other. That's why it is important during the experiment ... and throwing a ball to another rider.