At present, students and nonscientists still believe that a "theory" is just a mere hunch or a guess and that science is absolute. In this article, the author discusses that it is now time for teachers to correct these misconceptions. Teachers must explain to their students that the facts printed in science textbooks just happen to be the best theories at the moment and they are tentative and open to challenge. The author also urges teachers to remind themselves and those they mentor that a hypothesis is never proven correct and that no amount of experimental testing or evidence can prove anything in science. It is only when the scientist's results match his or her prediction that a hypothesis is supported.