An explanation of what radians measure: the angle in terms of the radius curved around the circle.
holy fucking shit, my entire education has just clicked.
I love seeing things click for other people (especially in math). That instant exhilaration is the reason math and science are fun for me.
Reblogging this because using animation as a teaching tool = fuckin boss
The Hetalia crew isn’t personifications of politics, cultures, or history. They are personifications of the unity of their people, of the fact that when it all comes down to it, we are mentally loyal to a certain place. This is why Prussia still lives, the Italies are separate, and Sealand exists at all.