In this activity students learn to evaluate the reliability (author, time and context) of sources in history. By going through a series of choices students will see that Who says something is often as important as what was said. This is a vital skill for progressing in any Common Core history course and I've found this to be a great way to introduce the topic. Students have fun with it and really learn the skill.
This activity, like all should be, is free. More free activities can be found at www.mrroughton.com.