Tyson describes extinction of species and the five great extinction events that wiped out numerous species on Earth, while some species, such as the tardigrade, were able to survive and continue life.
Tyson menjelaskan kepunahan spesies dan lima peristiwa kepunahan besar yang memusnahkan banyak spesies di Bumi, tetapi ada spesies-spesies seperti tardigrade yang selamat dan melanjutkan kehidupannya.