Curriculum 21, written by Heidi Hayes Jacobs, explores the need for a modern and relevant curriculum in the 21st century. The book advocates for a curriculum that goes beyond traditional subject areas and incorporates essential skills such as critical thinking, problem-solving, and collaboration. It provides educators with practical ideas and strategies for designing a curriculum that prepares students for the challenges of the future. The book also emphasizes the importance of integrating technology and global perspectives into the curriculum.