  In a recent paper by Jonasson and Steif, definitions to describe the
volatility of sequences of Boolean functions, \( f_n \colon \{ -1,1 \}^n \to \{
-1,1 \} \) were introduced. We continue their study of how these definitions
relate to noise stability and noise sensitivity. Our main results are that the
set of volatile sequences of Boolean functions is a natural way "dense" in the
set of all sequences of Boolean functions, and that the set of non-volatile
Boolean sequences is not "dense" in the set of noise stable sequences of
Boolean functions.
