superposition and interference explained

[@wenzhefrankhe9251]

这绝对是我一生看过的解释得最好的关于声波的视频，没有之一！这个老师太牛了，大神！
Second

[@zinedinezidane8398]

Great video, keep up the amazing work

[@PhysicsHigh]

+Zinedine Zidane Thankyou

[@iitzolii4864]

this video changed my life, thank you Paul

[@julialawless7094]

Almost as good as Khan Academy! :)

[@singularityhq]

Better

[@Yetipfote]

the mitochondrium is the powerhouse of the cell

[@celticph]

joe brought me here

[@SagarSawhney]

Me too.. lol

[@singularityhq]

who's joe?

[@proventus7]

@@singularityhq Joe Mama 😆

[@jonasschwerin4456]

Fourth :D

[@rafatahmed9952]

First