Видео с ютуба Khan Akademi

You Can Learn Anything

Cerebral cortex | Organ Systems | MCAT | Khan Academy

How to grow your brain

Atoms | Middle school chemistry | Khan Academy

Introduction to Grammar | Grammar | Khan Academy

Communism | The 20th century | World history | Khan Academy

Атомные спектры | Физика | Академия Хана

Elements | Middle school chemistry | Khan Academy