Idiom "scream (one's) head off"

The world's English mania

"TED" stands for "Technology, Education, and Design. It's the name of an organization that puts on events where scientists, artists, entrepreneurs, and teachers give really engaging short talks. They also make videos of these talks available online.
Here's one video of a talk about "the world's English mania":

Idiom "salt in the wound"

Words Of A High School Principal

A high-school principal may not be a very glamorous profession, but this woman recognized it as a chance to influence the young minds of the next generation and to maybe inspire change early on instead of trying to amend things after they’ve happened. Here’s her story:

How To Describe Reflections In Water

How To Describe Reflections In Water - Free Video English Lesson: 
In this crazy world, here is a peaceful video lesson. In this free video English lesson, you will learn how to describe reflections and how they make you feel. Listen and repeat - take one step every day on your road to better English.

Idiom "roll (one's) eyes"

Idiom "rolling in dough"