About 15,000 students and activists wearing pink ties on their heads formed a ''human wall'' at Sanaa University, which has become a hub for the protests.

''We choose pink to represent the Jasmine Revolution and to show that we do not want violence,'' said Rudhwan Masude, the head of the student union at the university.

No one expected any kind of revolution (pink, green, Twitter) to happen in poor Yemen. What in the world is going on in the Middle East? All we can do is watch and be amazed by this seemingly sudden social turbulence.