Sometimes we get stuck in a rut. We think we know it all. We stop doing our due diligence. We get up to give a speech that we've given a hundred times without thinking about it because we already know it all.
Then it happens. An expert in the field we are talking about who has done more research asks a question at the end of our speech that throws us off. It is a slap in the face - a dousing of cold water - we are caught off guard and now look a little foolish.
This is sort of what has happened to scientific researchers. Our knowledge of the moon, the closest celestial body to earth, was thought to be pretty strong. We knew there was no water on the moon's surface - it's dry isn't it? Surprise! There's water on the moon! Needless to say, this has become a shock to researchers.
Don't let something like this happen to you. If you are giving a speech that you have given numerous times and feel like you know it all - look it over again. Make sure you've done your research. Maybe you'll discover something new and exciting that you can then add to your speech. That way, you won't be shocked when someone tells you that there is water on the moon.