Common knowledge is sometimes not so common. This is because you’ve heard all the facts above from the news, your friends and everyone around you. Chances are, you have spread some false information around, thinking that you are right all along.
Few take the time to run a back check on everything they hear. And sources such as the news, textbooks and studies should be reliable enough for everyone to refer to as true. Additionally, some of the information above has been around for a very long time and no one would think that they could be false.
A great take away from the post is, when in doubt about something- run a quick check. This holds especially true today, where information is circulating at a rapid rate.