These sample lessons give students a way to quickly review the most popular topics in math, science, history, and more! Most lessons end with a quick practice quiz to make sure you understood what you read. Lessons are a great way to review what you're learning in school, or to get ahead!
Ever wonder what the difference between a direct and an indirect object is? How about a few tips to avoid plagiarism? Do you know where the planets' names come from? We do, and we're here to help! If you're learning English as your second language, be sure to view our ESL section for some basic grammar lessons and tips for learning vocabulary.
Need a quick review on the Order of Operations? How about the process for converting from degrees to radians? Can you explain the proof of the derivative of ex? We can help you understand math topics from basic algebra all the way through calculus!
Want to be able to explain the processes of endocytosis and exocytosis? Want a quick review of the types of chemical bonds? We can even help you figure out the difference between kinetic and potential energy! We have a ton of science review pages, so expand your knowledge today!
Need to know when to use ser and estar? How about a review on the different uses of "se"? We've also got you covered when it comes to conjugating verbs, including those pesky stem changing verbs. If you need to practice speaking, we can help you find a Spanish tutor today!
Have you ever wondered what it was like to hear Dr. Martin Luther King, Jr. give his famous "I Have a Dream" speech? Need to hear some of the original audio recorded during the Cuban Missile Crisis? Here, we've recorded a ton of the most famous speeches and audio recordings from the 20th and 21st centuries. We also have some biographical summaries of world leaders like Winston Churchill and Franklin Delano Roosevelt.