Charlie talks about surface tension in water and why it makes drops of water try to be spherical and puddles attempt to become circles. He also talks about optimization theory and how it applies to matching organ donors with people who need organs.
Beakman demonstrates how water has a "skin" (aka water tension) by showing a water glider on water and a basket sitting in water. When he sprays the water with soap, the basket can no longer sit on the water. Using a cartoon movie, he explains why water can't get dirt out of cloth because of surface tension but add soap and now the water can go into the fibers and get the dirt.
Beakman covers hot springs and geysers and how they are used by people for electricity and to improve health. He shows some footage to explain how water in geysers is heated and shoots out of the Earth's surface.