Use the scientific method as a way of thinking about science.
Children can't follow the scientific method and test everything their parents say.
I'm not talking about the scientific method used in the laboratory.
"They are all the same when you use the scientific method."
They must understand the scientific method and some history of science.
However, these days most people think such questions are best answered by scientific methods.
They often use what is called the scientific method to do this.
The scientific method is the important thing; not how much we know.
The systematic approach, used in research, is of the scientific method.
Then explain to them what they did was scientific method.