In this lesson, students learn about the effects of heavy drinking on the developing teen brain, specifically the critical ages between 12 and 21. The discussion includes the differences in how alcohol affects adolescent brains compared to adult brains, emphasizing the importance of this developmental stage. Students are reminded of the legal restrictions against underage drinking and the potential permanent consequences of alcohol consumption on brain development and health. The lesson underscores the significance of making informed choices during this crucial time in life, as it can impact their future cognitive abilities and overall well-being.