What is a "blue moon", and will it make me sad?

What is a "blue moon", and will it make me sad?

Professor Gizmo (Amazing Science Presentations) gives expert video advice on: Why do we need to wear a space suit in space?; Why do things float around in space?; Why do stars twinkle? and more...

No, a blue moon will not make you sad. A blue moon is a term that simply refers to the fact that the moon will have its full moon phase twice in one month, and the moon's phases are once every 28 days so that rules out ever having a blue moon in the month of February.