The myth is that a watched pot never boils. Of course this means more than just in the kitchen. It speaks of how watching the clock and waiting for something to happen will drag out the time it takes. But what about in the kitchen?
It turns out that this myth is kind of true. While an uncovered pot will eventually boil on a high enough heat setting, covering the pot with a lid will actually cause the liquid to boil faster. This is because the heat gets trapped in the pot and allows the temperature to rise more quickly, instead of letting it out as an uncovered pot would. Just remember that a pot can still boil over with a lid so use appropriate heat settings and watch whatever you have on the stove.
So, the next time you are boiling water for pasta or anything else, remember to put a lid on it!