Science

National Science Teaching Association (NSTA) free K-12 teaching resources - Includes over 800 lesson plans, book chapters, videos, simulations, and more - vetted by NSTA curators.

Siemens STEM Day - Siemens STEM Day offers a variety of K-12 tools and resources with original hands-on activities, career connections, and a teacher support center including an implementation Toolkit.

Discovery Education - Flipped learning is easier when you have access to hundreds of thousands of K-12 digital resources, and with Experience you can assign individual pieces or even a whole folder of content to your students no matter where they are.

University of Colorado Boulder PhET - Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations for K-16.

National Science Foundation - Welcome to Classroom Resources--a diverse collection of K12 lessons and web resources for classroom teachers, their students and students' families.