Highbrow — 10-day courses delivered in easy-to-digest emails every morning.

Listenable — Learn new things through bite-sized audio courses while you’re doing something else.

WikiWand — Slick new interface for Wikipedia.

Britannica — General knowledge encyclopaedia.

University of Reddit —Web-site where Redditers could teach each other.

TodayILearned — SubReddit where people share interesting general knowledge facts.

Quora — A question-and-answer website where questions are asked, answered, edited and organized by its community of users.

BrainPump — Library of entertaining videos on general knowledge topics.

Khan Academy — Service offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace.

TED Ed — Library of short educational videos.

Socratic — Educational Q&A site where students ask questions and our community teaches them the answer.

Crash Course — Educational YouTube channel.

Mental Floss — Test your knowledge with amazing and interesting facts, trivia, quizzes, and brain teaser games.

Brain Pickings — Insightful long form posts on life, art, science, design, history, philosophy, and more.