The study of Child murderers and of adult that murder children , 

Above are to killers. Mary Bell and a girl that's only known as Nevada 

child_killers_mary_bell.html

/wiki/Child_murder

       Nevada was "all the rage" on the internet , a long time ago. 

For whatever reason the internet lost interest in Nevada . Like a hit song that simply fades away; but is never forgotten. Safety Dance',  for instance