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It's a practical guide to building 21st century-student competency in the "4 C's" - critical thinking, collaboration, communication, and creativity/innovation. The book is designed for middle school and high school teachers, instructional coaches, and school leaders. It also shows how the 4 C's in a PBL context align with the Common Core State Standards. Sample projects, CCSS-aligned 4 C's rubrics, tips for technology in projects, notes for school leaders on building support for 21st century learning with PBL. Authors: Suzie Boss, author and BIE National Faculty, and John Larmer, Editor-in-Chief, BIE

Solar Street Light is a kind of luminous lighting equipment that does not require external power supply but collects light energy through solar panels during the day and converts solar energy into electrical energy at night, now it has been used in some places. However, solar street lights will also be subject to many restrictions such as scenes in practical applications. So what are the application scenarios of solar street light? Hereby the editor of Second Sun will give you an introduction. Scene 1: Rural area Rural areas are very suitable for the application of solar lights. In some rural areas, the environmental conditions are harsh, the terrain conditions are complex, and the cable laying is more difficult. Even if it is easy to lay, the cost of using city circuit lights is very high under the overall budget, and it is more likely that the price of using city circuit lights exceeds the price of using solar street light. In addition, solar street light is simple to install, have a long service life, and require no maintenance within more than 5 years. The roads in rural areas are narrow, the height of street light poles is low, and the brightness requirements of LED light sources are not too high, so it is suitable for rural areas.