An introduction to the properties of H2O and its components: hydrogen and oxygen. This clip also explains that water has highest cohesion of any nonmetallic liquid, which allows other substances to stick to it.
Hank explains why solid water is less dense than liquid water even though solids are typically more dense than liquids. He also discusses how the high heat capacity of water helps support life on Earth. He uses the bodily process of sweating to exemplify water's unique properties.
The hosts provides an overview of how life on Earth started. He mentions the eons in which life formed and explains the RNA World Hypothesis, which states that early life relied on RNA rather than DNA.