Reading Explorer is a six-level series of intensive reading texts and Reading Explorer 2 is one level in that series. It uses articles from National Geographic Magazine to promote reading comprehension and to develop the vocabulary skills of ESL young adults and adult learners. The length of the reading passages, vocabulary presented, level of difficulty of texts, and comprehension questions make Reading Explorer 2 a textbook suitable for learners whose proficiency ranges from upper-basic to low-intermediate. The textbook contains twelve units, and each unit has two reading passages whose topics are related. For instance, in lesson 4A students read about the “Grand Central Terminal” in Manhattan, and in lesson 4B they read about “Mumbai: City of Dreams.”