Inappropriate sites are easy to access either by mistake or on purpose.
Due to the nature of this particular lesson, it is important for the teacher to preview the sites. Since this activity has students looking at pseudoscience sites, it is important to see if there are any personal, school district or local concerns in having students study such pseudoscience sites. This activity does not in any way try to tell the students that any of these sites are true or false or to be believed or not. The student is simply asked to apply the scientific method of proof to one of these topics. Look at issues critically.