What do Theoretical Physicists Do?

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Edward Hessler

Have you ever wondered what it is that theoretical physicists do?

Over at her blog BackReaction, Sabine Hossenfelder who is a theoretical physicist tells us what  theoreticians "do do," to use the immortal words Elizabeth asked Inge in Young Frankenstein. 

Dr. Hossenfelder calls attention to the fact that all of physics has an "experimental part and a theoretical part." What makes theoretical physics "special is in the amount of mathematics that we use in our research." This is something that "mathematics does remarkably well."

As usual Dr. Hossenfelder provides two formats: video and text. I also recommend you scan the comments and her responses.