3. What made DNA obsolete as the only source of information about humans?
(a) Quantum theory.
(b) Culture.
(c) Language.
(d) Song.

4. What laws might allow space-time to warp to allow a spaceship to travel through the past?
(a) The laws of aerodynamics.
(b) The laws of physics.
(c) The laws of calculus.
(d) The laws of geometry.

5. What kind of theory do we not have yet that is essential to figuring out time travel?
(a) Simmon's spacetime theory.
(b) Quantum gravity theory.
(c) Feynmann's historical theory.
(d) Gravitational theory.

6. What are cosmic strings?
(a) Objects with length but tiny cross sections.
(b) Planes with narrowly etched furrows.
(c) Sections of space divided into tiny lines.
(d) Points between which waves connect.

7. How can half-determinism be preserved in relation to black holes?
(a) If Strominger and Vafa's 1996 postulation is true.
(b) If subatomic travel is curved.
(c) If Einstein's theory of general relativity is true.
(d) If space-time is directed by Planck lengths.

8. What can Penrose and Hawking's machinery help them study?
(a) Solar belts and singularities.
(b) Singularities and black holes.
(c) Planetary rings and asteroids.
(d) Black holes and the middle of the earth.

9. What partially restores determinism as a view?
(a) Quantum mechanics.
(b) Quantum leaps.
(c) Quantum hopes.
(d) Quantum curvature.

10. What final state does Hawking wonder if humanity will ever reach?
(a) Science and technology.
(b) Ecology and biology.
(c) Geography and geology.
(d) Chemistry and physics.

11. Where does one set of possibilities lie in relation to using the laws of physics to explore the galaxy?
(a) DNA.
(b) RNA.
(c) MNA.
(d) SNA.

12. What are the size of biological brains limited by?
(a) Proteins.
(b) The womb.
(c) The genome.
(d) Animo Acids.

13. What does Hawking explain particles do not have?
(a) Easily-shaped positions.
(b) Well-defined positions or velocities.
(c) Round-bodied physics.
(d) Molecular shapes.

14. What kind of fluctuations do we have to consider to answer whether or not time travel is possible?
(a) Spatial fluctuations.
(b) Geological fluctuations.
(c) Quantum fluctuations.
(d) Spacetime fluctuations.

15. What does Hawking think black holes radiate?
(a) Light.
(b) Heat.
(c) Sound.
(d) Energy.