Mongoose Find Issue

mongoose_find.js

var path = path = require('path');
require.paths.unshift(path.join(__dirname, "../node_modules"));
require.paths.unshift(path.join(__dirname, "../vendor"));
require('noop');

var mongoose = require('mongoose'),
    Schema = mongoose.Schema;
mongoose.connect('mongodb://localhost/pumper');
    
var ObservationSchema = new Schema({            
  date_time: Date//{ type: Date, index: true }, 
});

var UserSchema = new Schema({            
  date_time: Date//{ type: Date, index: true }, 
});

mongoose.model('Observation', ObservationSchema);
mongoose.model('User', UserSchema);

var Observation = mongoose.model('Observation'),
    User  = mongoose.model('User');
 
var o = new Observation({ date_time: new Date() });
o.save(global.throwop);

mongoose.model('Observation').find({}, null, {}, function(err, observations) {
  console.dir(observations);
});

Yep. Same deal.