What's the point of covering a pot of water you've set to boil?

by Cookthink

A watched pot never boils? Well, put a cover on said pot and it will boil before you know it, even right before your very eyes. Putting a cover on a pot of water you've set to boil is one of those time- and energy-saving tricks that is so obvious that it just may take years for it to dawn on you.  Covering your pot will trap heat, prevent evaporation, build pressure, and get your water boiling faster. Just remember that once you remove the lid, it will take the water a moment to return to a full boil.