I like arguments. In fact, I encourage students to argue in class. When a student argues, he or she has a grasp of the subject matter. The student is willing to state his or her opinion, even defend it, if need be. Presenting arguments represent a big milestone for independent thinking. However, a student must also have proof that his or her argument is valid.

 Teacher: The Earth is made up of land and water. Does Earth have more land or more water?

Student: More water!

Teacher: How do you know?

Student: I can see it. And I read it from a book. My mom also told me that there's more water than land.

Teacher: Prove it!

Student: I just know! Everyone knows! It is so easy!

Teacher: Just because we read something from a book does not mean it is all true. You have to be able to prove everything that you read or learn. A good writer will give you proof of the facts. A good writer will give you references to validate what he or she said. Being a scientist is all about showing that proof. If you have proof, that shows you have done your work and research. You cannot use something based on what someone said or something from a book and argue about it without being able to proof your result.

The fact remains that if we look Earth as a 4-quadrant grid, 3/4 of that is water and 1/4 is land. But, only less than 10% out of all the water on Earth are useable. Most of them are either salt water or polluted. We can only use clean fresh water. Thus, reducing water usage or any of Earth's resources for that matter becomes very important for our future.

And that's it for today's lesson.