MongoDB $where queries and tailable cursors — WAS: date math best practices?

The $lte operator (and other range queries) will work and utilize indexes, but it cannot evaluate expressions. You have to query against a query-time constant (which would be 'now - 30 min').

A similar question was answered at Query Mongodb on month, day, year... of a datetime.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.