A few years back, I had my old 45 RPM records out to look through and
my daughter asked what they were. I explained that back in the 1960s,
before CDs were invented, this was how we listened to music. I
further explained how all the bands issued singles on these "45s,"
and radio stations would rate the top 40 songs every week.

She was quite impressed as I continued describing how one used a
phonograph to play them. I burst out laughing when she asked --
perfectly straight faced -- "Daddy, how many megs of RAM does one of
these hold?"