You may have noticed elements of the 1990s creeping back into comics, music, movies and TV. There’s a reason for that: pop culture seems to be obsessed with its past on a 20-year cycle, and the current love affair with the 1980s has passed its peak.

I go into more detail — including thoughts on some of the implications for the 10-year and 30-year troughs in the cycle — at Speed Force in Return of the 1990s.