"The Hum" Scientists think they have found the Answer

[Nanny]

Time for a Hum report. Have heard the same sound now eight or so times in the last 4 approx. weeks. It's never been the full Railroad sound for this time period. It's a wimpy, partial version of that. Not realistic but don't know what else to describe it as, and this may as well be a joke though absolute truth. The bathroom is the best room to detect it in! has got to be since it's a very quiet room, with door closed. The sound always seems as if it's behind me. What the heck with this?

Still....always at night, with doubting myself thinking I heard it early one morning but now I'm just not sure.