Grade Level: N/A. Interest Level: 4,5,6,7,8,9,10,11,12. Reading Level: 3,4. Critical reading, thinking, and understanding are required in order to answer the questions that follow each of the short articles in this 25-lesson book. Some of the questions call for factual answers found in the text. Other questions are based on the reader's ability to apply logic, make inferences, recognize cause and effect, draw conclusions, and use reason to come up with answers. Clever illustrations pertaining to the topics are sometimes part of the comprehension process.