Dr. Cheever and Alan debate the severity of the virus and the steps taken to investigate it. Alan suspects that Dr. Cheever's organization is hiding knowledge because of a Facebook posted written by one of the organization's members. Alan then describes to the public an R0 of two. He indicates that the virus will grow at an exponential rate of 2, infecting a billion people within three months.
Mother penguins transfer their eggs to the father penguins so they can go hunting. One penguin couple successfully transfers the egg without damange. Another penguin couple do not succeed and their egg cracks and freezes.
Hank provides background information on the biologist who contributed to evolutionary history: Charles Darwin. He also explains the four principles of Darwin's idea of natural selection, which are variation, heritability, struggle for existence, and survival and reproduction rates.
Key Words: Genetic Drift, Fitness, Variations of Phenotype, Heritable, The Struggle for Existence, Survival and Reproduction Rates
Hank explains what defines a species: the ability to create fertile offspring. He also explains the conditions that are required to create an entirely new species.
Key Words: Species, Hybrids, Evolution, Speciation, Reproductive Isolation, Post-zygotic, Pre-zygotic, Allopatric Speciation, Natural Selection