Just because you find it on Google - does it mean it's true?
Read about Christopher Columbus and think about what you already know. How accurate is the article? Can you trust it? Even if you cited it, would your teacher accept it? How would your friends react if you gave them some of these facts?
Check out one other Explorer and see if what you think about their bio as well. Is this website trustworthy? What are the hints that tell you yes or no?