Spend an afternoon reviewing the statistics. Discover how the Krebs cycle works. Learn about the fundamentals of musical notation. Or, if you feel particularly adventurous, learn how the fire-stick breeding changed the landscape of Australia. It does not matter if you are a student, teacher, home educator, principal, adult who returns to the classroom after 20 years or a friendly alien who simply tries to enter earthly biology: Khan Academy materials and resources are available for you completely free of charge.
(4.1 and up)
,Jelly Bean (4.1 - 4.3.1),KitKat (4.4 - 4.4.4),Lollipop (5.0 - 5.1.1),Marshmallow (6.0 - 6.0.1),Nougat (7.0 – 7.1.1),Oreo (8.0-8.1)