1. Teacher Guide This lesson is designed to teach kids to ask a critical thinking question that you can’t just put into a search box to solve. To do that, we encourage them with smaller questions that search can help them answer. Make sure that you read the notes for each slide: they not only give you teaching tips but also provide answers and hints so you can help the kids if they are having trouble. Remember, you can always send feedback to the Bing in the Classroom team at BingInTheClassroom@Microsoft.com. You can learn more about the program at bing.com/classroom and follow the daily lessons on the Microsoft Educator Network. BingInTheClassroom@Microsoft.combing.com/classroomMicrosoft Educator Network Want to extend today’s lesson? Consider using Skype in the Classroom to arrange for your class to chat with another class in today’s location, take a Skype lesson on today’s topic, or invite a guest speaker to expand on today’s subject. And if you are using Windows 8, the panoramas in the MSN Travel App are great teaching tools. We have thousands of other education apps available on Windows here. Skype in the Classroom another class take a Skype lesson invite a guest speaker MSN Travel App here Nell Bang-Jensen is a teacher and theater artist living in Philadelphia, PA. Her passion for arts education has led her to a variety of roles including developing curriculum for Philadelphia Young Playwrights and teaching at numerous theaters and schools around the city. She works with playwrights from ages four to ninety on developing new work and is especially interested in alternative literacies and theater for social change. A graduate of Swarthmore College, she currently works in the Artistic Department of the Wilma Theater and, in addition to teaching, is a freelance actor and dramaturg. In 2011, Nell was named a Thomas J. Watson Fellow and spent her fellowship year traveling to seven countries studying how people get their names. This lesson is designed to teach the Common Core State Standard: Reading—Informational Text CCSS.ELA-Literacy.RI.4.3CCSS.ELA-Literacy.RI.4.3 Explain events, procedures, ideas, or concepts in a historical, scientific, or technical text, including what happened and why, based on specific information in the text. CCSS.ELA-Literacy.RI.4.5CCSS.ELA-Literacy.RI.4.5 Describe the overall structure (e.g., chronology, comparison, cause/effect, problem/solution) of events, ideas, concepts, or information in a text or part of a text. CCSS.ELA-Literacy.RI.4.9CCSS.ELA-Literacy.RI.4.9 Integrate information from two texts on the same topic in order to write or speak about the subject knowledgeably.

2. © Paul Nicklen/Getty Images Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

3. The word “cenote” (pronounced seh-NO-tay) comes from the Mayan word “Ts'onot” meaning “well.” Ancient Mayans in the Yucatan Peninsula of present-day Mexico knew that openings to these freshwater caves dotted the landscape, sometimes hidden within the forest. Today, scuba divers can explore some of the Yucatan’s cenotes. The entrance pools often appear as small sinkholes or ponds, but open up into large limestone cave systems below the surface. Though most contain freshwater, some reach deep enough to connect with the Yucatan’s vast aquifer system, where divers might encounter saltwater at lower levels. This cenote is near the town of Akumal, a new settlement established in 1958 as a community intended especially for scuba divers. If you’re interested in plunging into the hidden underwater world beneath the woods, you’ll find plenty of like-minded folks in Akumal. Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

4. 1 Video Search Find a video that explains how humans breathe. What body parts are involved? What happens to the air that you breathe in? 2 Web Search What do humans breathe in? What do humans breathe out? 3 Web Search How are the molecules in water different from the molecules in air? 4 Web Search How do fish “breathe” water? What do they have that humans don’t have? 5 Web Search What is it about human lungs that make them unable to breathe water? Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

5. 5 Minutes Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

6. 1 Video Search Find a video that explains how humans breathe. What body parts are involved? What happens to the air that you breathe in? 2 Web Search What do humans breathe in? What do humans breathe out? 3 Web Search How are the molecules in water different from the molecules in air? 4 Web Search How do fish “breathe” water? What do they have that humans don’t have? 5 Web Search What is it about human lungs that make them unable to breathe water? Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

7. 1 Video Search Find a video that explains how humans breathe. What body parts are involved? What happens to the air that you breathe in? Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

8. 2 Web Search What do humans breathe in? What do humans breathe out? Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

9. 3 Web Search How are the molecules in water different from the molecules in air? Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

10. 4 Web Search How do fish “breathe” water? What do they have that humans don’t have? Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?

11. 5 Web Search What is it about human lungs that make them unable to breathe water? Why do humans need scuba diving equipment to breathe underwater when other animals are able to do it on their own?