How does a health insurance work? (English; with TK)

What?:  Marie Wellendorf and Sebastian Tost from the Techniker Krankenkasse (TK health insurance) inform you about the German health care system and answer your questions.
Content overview:
•  Important facts about the German health care system 
•  What do I get for my money and how? 
•  What to do if I feel sick?
•  Special: What do I get if I do something good for my health?