Chromium plating on an object will be lighter than a similar object made entirely out of stainless steel. While chromium is valued for its high lustre, this high lustre tends to make the material more susceptible to dirt and grime. Between stainless steel and chrome, stainless steel is the more expensive metal. Sources 1  [+] https://en.wikipedia.org/wiki/Chrome_plating.  https://en.wikipedia.org/wiki/Stainless_steel.
The reason a colleague plays mind games at work for instance might be very different to the reason your partner plays mind games and tests you. The first reason that many people play mind games is undoubtedly in order to get back some control.
The reason the character of Edna is always played by a man is because the characters don't think she is a man. It's a secret the audience shares but the characters do not.. It seems that Waters didn't want to answer the question directly because he didn't want it to be a question at all.