Prior to Yurkin and PNDB, the previous owner of the photographs acquired them from her uncle, who worked at the local newspaper at the time of the event.

95 PNdB is the exterior noise level below which current evidence suggests that the average person in an uninsulated room is unlikely to be awakened.

It is to be noted that the NNI calculation reflects a logarithmic element in the PNdB scale, which has the result that every increase of 10 in that scale represents approximately a doubling of the loudness.