Provide examples that show how some scientific knowledge is very old and yet is still applicable today.
Unifying Concepts of Science.
Nature of Science (NOS)
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Realize that if more than one variable changes at the same time in an experiment, the outcome of the experiment may not be clearly attributable to any one of the variables.
Discover how a system may stay the same because nothing is happening or because things are happening that exactly balance each other out.
Explain that scientists do not pay much attention to claims about how something works unless they are backed up with evidence that can be confirmed with a logical argument.
Recognize that thinking about things as systems means looking for how every part relates to others.
Understand that things change in steady, repetitive, or irregular ways, or sometimes in more than one way at the same time; often the best way to tell which kinds of change are happening is to make a table or graph of measurements.