9th Grade

Confronting The Big Questions: Highlights of Modern Astronomy

An introduction to modern astronomy’s most important questions. The four sections of the course are Planets and Life in The Universe; The Life of Stars; Galaxies and Their Environments; The History...

Congruence

Two figures are congruent if you can go from one to another through some combination of translations, reflections and rotations. In this tutorial, we’ll really internalize this by working through...

Conic Sections

Parabolas, hyperbolas, ellipses and circles, plus how to identify a conic by completing the square

Conic sections

Sal introduces the four conic sections and shows how they are derived by intersecting planes with cones in certain ways.

Cooking

Cooking isn't just an art.Explore topics ranging from heat and photosynthesis to bacteria, as you learn some secrets behind favorite foods and recipes.All learners can discover the fun of cooking...

Cool Halloween Science Experiments!

Make your Halloween party the best ever with these amazing Halloween experiments from Steve Spangler! Includes: Fake blood Dry ice bubbling acid Bleeding paper Exploding pumpkins Glowing pumpkins...

Cosmology and astronomy

The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we...

Crash Course: Biology

Hank Green teaches you biology!  This awesome YouTube playlist covers all the basics of Biology, including carbon, molecules, cells, membranes, respiration, photosynthesis, and much more.

Crash Course: World History

John Green teaches you the history of the world in 42 episodes of Crash Course. Learn, study and understand all the important civilizations, empires, wars, and revolutions the world has seen so far.

Curriki Algebra 1

This OER Algebra course was sponsored by AT&T and developed by Curriki. This course consists of five units aligned to the Common Core. Each unit culminates in a project that utilizes mastery of...

Curriki American History Units

This collection of Open Educational Resources (OERs) has been curated by Curriki for all educators, parents, and students of history. It includes resources that span the scope and sequence of an...

Curriki Geometry

This collection includes resources that are used throughout the six projects of Curriki Geometry. Curriki is grateful for the tremendous support of our sponsor, AT&T Foundation. Our TeamCurriki...

Curriki High School Physics Collection

Collection of high school Physics resources aligned with the  Next Generation Science Standards.

Daily Grammar

This archive contains links to all of our free grammar lessons and quizzes.  Daily Grammar consists of 440 lessons and 88 quizzes.  Lessons 1-90 cover the eight parts of speech, which are verbs,...

Data, Probability and Statistics

Dave Conservatoire

Welcome to Dave Conservatoire - a free online music school, aiming to provide a world-class music education for everyone. Join Dave, your friendly guide, in over 100 video music lessons,...

Desmos

Graph functions, plot tables of data, evaluate equations, explore transformations, and more.

Developing An Entrepreneurial Mindset: First Step Towards Success

This course is the first in a series on starting a business. Though new venture creation is the focus of the specialization, this course is important for everyone. It provides learners with...

Developing iOS 10 Apps with Swift

Updated for iOS 10 and Swift. Tools and APIs required to build applications for the iPhone and iPad platforms using the iOS SDK. User interface design for mobile devices and unique user...

Develop Powerful Interactive Software

This Specialization covers intermediate topics in software development. You’ll learn object-oriented programming principles that will allow you to use Java to its full potential, and you’ll...

DGMD E-10: Exposing Digital Photography

This course explores the artistic aspects, scientific foundations, and techniques of digital photography with the goals of enabling students to expand their knowledge of photography as an art form,...

Differential calculus

Missions recommend what to learn next, help you remember what you’ve learned by mixing skills, and save your progress.

Digital Literacy Library

Find lessons designed by experts to help young people develop the skills to navigate the digital world, consume information, and responsibly produce and share content.

Digital Photography Tutorials

Learn how to take and edit digital photographs using visual tutorials that emphasize concept over procedure, independent of specific digital camera or lens. Tutorials cover the basic workings of...

Discovering Science Program

Learn about the extraordinary world of everyday chemistry, and earn 10 credits from the University of Leeds The Discovering Science program consists of five short online courses. Each course looks...

Document Analysis Series: Civics & Economics

This series focuses on case-study questions investigating controversial topics in Civics and Economics. Students explore background movies and analyze primary-source documents from varying points...

Document Analysis Series: U.S. History

This series focuses on case-study questions investigating controversial topics in U.S. History. Students explore background movies and analyze primary-source documents from varying points of view...

Document Analysis Series: World History

This series focuses on case-study questions investigating controversial topics in World History. Students explore background movies and analyze primary-source documents from varying points of view...

Drive Right

In this course, students will be empowered to help reverse unsafe teen driving trends by exploring the major causes of teen crashes: speeding, the influence of passengers, and distractions....

Duolingo

Personalized education.Everyone learns in different ways. For the first time in history, we can analyze how millions of people learn at once to create the most effective educational system possible...