2. The Spooky Universe

Neil deGrasse Tyson discusses the fundamentals of matter. He begins by looking at the discovery of the electron, proton, neutron, quark, and neutrino. He then discusses Einstein's theories of relativity and its implication for traveling near the speed of light. He also looks at the unusual implications of quantum mechanics and talks about how quantum tunneling is crucial to producing fusion in the sun. He also discusses the properties of light and the equivalence of mass and energy.

3. Inexplicable Life

Neil deGrasse Tyson examines the origin of life in the universe. He begins by considering some reflections by the astronomer Christiaan Huygens before discussing why life's origin is such a difficult scientific topic. He then looks at the early planet Earth and discusses why there is only one tree of life. He considers extremophiles that have the ability to live in environments that appear hostile to life and examines the theory that microscopic life may have originally come to Earth from outer space. He talks about chirality in organic molecules before discussing the question of intelligence

4. Inexplicable Physics

Neil deGrasse Tyson discusses the mysteries of the periodic table. He talks about how electron shells have bearing on reactivity. He also examines the idea of whether there is an island of stability beyond element 118. He then discusses the fundamental particles that make up matter and transmit forces. He then examines string theory and the mystery of black holes.

5. Inexplicable Space

Neil deGrasse Tyson discusses the move from classical physics to modern physics. He then examines the Pioneer Anomaly and how the Pioneer space probe is slowing faster than predicted. He discusses dark matter and how it accounts for the gravity of the universe even though we know next to nothing about it. He then examines dark energy which is the unknown force causing the expansion of the universe to accelerate. He also considers some anomalies facing quantum mechanics and the theory of the Zero-energy universe. Finally, he examines the likely collision between the Milky Way and the Andromeda galaxy.

6. Inexplicable Cosmology

Neil deGrasse Tyson discusses the merging of the theory of the small (quantum mechanics) and the theory of the large (relativity). He then considers the possibility of the multiverse and what existed before the Big Bang. He examines the mystery of the matter/antimatter asymmetry in the universe and considers whether anything can travel faster than light. He considers wormholes and discusses the long term fate of the universe.