do u trust what i say

In psycology class we have been talking about not believing everything that is told to you. Our professor told us that George Washington was not the first president of the United States he named off another guys name and showed a picture of him. He said your teachers before hand have never shared this information with you, because it is an extremely new fact that has just been proved. Everyone in the class looked at each other like "No Way". For my whole life I believed he was the first president and now all of a sudden he isn't. Our professor started to smile and said don't believe everything I say. He said just because he is a professor doesn't mean what he is telling us could be the truth. Professor Truelove was showing us we needed to not be so trustworthy. If something is said that you aren't a 100% sure about go look it up and research it. Now don't go to Wikipedia, because that will do you know good. Think about things and prove that was you are being told is true. When you heard Pluto wasn't a planet for the first time did you believe the person that said that too you. So, know where to get the right facts from and don't be fooled so easily. Who knows I heard John Adams was actually are first president, am I right go find out and see?