gistfile1.js

Posts = new Mongo.Collection("posts");

if (Meteor.isServer) {
	Meteor.publish("posts", function(timeStamp) {
		var selector = timeStamp ? { createdAt: { $gte: timeStamp }} : {}; 
		var options = timeStamp ? {} : { limit: 10, sort: { createdAt: -1 }};
		return Posts.find(selector, options);
	});
}