YouTube is a free university.

But there are more than 38,000,000 channels there and it's hard to find the good ones.

Here are 10 channels that will make you smarter:

1/ Kurzgesagt (@Kurz_Gesagt)

Animation videos explaining things with optimistic

2/ CrashCourse (@TheCrashCourse)

Short courses on a wide variety of subjects, including organic chemistry, literature, world history, biology, philosophy, theater,

3/ Veritasium (@veritasium)

An element of truth - videos about science, education, and anything else

4/ Practical Engineering (@HillhouseGrady)

All about infrastructure and the human-made world around