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.
Especially interesting in this study: the volunteers who said they enjoyed playing the video games had even higher increased gray matter. (Also, as Kotaku has reported, the size of certain parts of your brain may be related to how good you are at playing video games. It all makes sense now!).