Two stories of falling in everyday life, and one fantastical leap:
6. Falling Asleep: Professor Frederick Coolidge argues that our tree-dwelling ancestors are to blame for a hiccup in our sleeping patterns.
7. Walking as Falling: David Eagleman explains walking as the act of calibrating our steps to turn falls into forward motion.
8. Falling Apart: Neil deGrasse Tyson takes us on a one-way trip into a black hole.