How to calculate a black hole's mass
The black hole's event horizon circumference
A black hole's gravitational lens
A black hole's gravitational blueshift
Gravitational time dilation
Anatomical dissection of black holes
Embedding diagrams for warped space-time
Gravitational wave recoil
Optical appearance of a collapsing star
Gravitational distension near a black hole's heart
Wormholes, cosmological doughnuts, and parallel universes
Postscript 1: Could we be living in a black hole?
Postscript 2: The grand internet black-hole survey.
