acceptability
131Fertility awareness — Background Birth control type Behavioral First use 1950s (mucus) mid 1930s (BBT) 1930 (Knaus Ogino) Ancient (ad hoc) Failure rates (first year) Perfect use Symptoms based: 1 3% Calendar based: 5 9% …
132Nuclear power — Atomic Power redirects here. For the film, see Atomic Power (film). This article is about the power source. For nation states that are nuclear powers, see List of states with nuclear weapons …
