Phil demonstrates buoyancy using different types of fluids and different objects. He defines fluids and explains why air and solids such as sand can both be fluids.
Buster Beaker explains how high and low tides are affected by the gravity of the moon and the sun. He illustrates the phenomenon using a cookie, a mushroom, and a lemon.
Phil demonstrates potential and kinetic energy using an old traffic controller and a bagel. He explains the difference between the two types of energy.
Sal puts all of the polymers in his shop on sale, which means just about every item has been discounted. He mentions the different types of polymers that exist and illustrates that they are more than plastics.