CK-12.org - From commonsense.org...Making science, math, social studies, etc. accessible to students with different learning styles.
Crash Course - From the YouTube channel...The Crash Course team has produced more than 32 courses on a wide variety of subjects, including organic chemistry, literature, world history, biology, philosophy, theater, ecology, and many more!
Khan Academy - From the website...Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computing, history, art history, economics, and more, including K-14 and test preparation (SAT, Praxis, LSAT) content.
Learn.Genetics/Genetic Science Learning Center - From commonsense.org...Biology teachers and students will find a lot of useful multimedia to help them teach and understand complex genetics topics.
National Geographic - Topics include animals, environment, history & culture, science, and travel.
The Public Library of Science (PLOS) - From the website...The PLOS is a nonprofit, Open Access publisher empowering researchers to accelerate progress in science and medicine by leading a transformation in research communication. [Articles are] rigorously reported, peer reviewed and immediately available without restrictions, promoting the widest readership and impact possible.