The filtering example is that we are filtering for events/choices. To use real numbers: We have 10,000 universes, 5000 support life, 5000 do not. Out of the 5000 that support life, 2500 have an earth, and 2500 do not. Out of the 2500 that have earth, 1250 have a Mark, 1250 do not. Out of the...