clearly, the word is common and abstract enough that anyone can claim it's usage
Exactly. Usually, no trademark issues are raised when the two companies' activities are so different.
My guess in that case is that the German Metro wanted to avoid a splash of bad notoriety in case Windows 8 is a flop.
So much so, I wonder if the police monitor tweets and store potentially interesting ones?
Why wonder? Just assume that some agency, somewhere, does. Maybe not the police, but with all the agencies that could be interested in this, it's likely that this happens!
at least as measured by IQ
This is the most important part... Don't forget that our definition of intelligence today might be very different from the original "natural" one, as in "surviving in a wild environment". Maybe the bigger brain is better suited for the wildlife thing; from TFA: "Animals with larger brains relative to their body size have been shown to be more likely to thrive when introduced to new places"
On an another subject, I cannot find the curve they're referring to, to predict the brain size from the body's. From what I understand, it seems to be really curvy, not linear, so I am not sure it is that reliable for such predictions...Moreover, it is only applicable to mammals.
"Survey says..." -- Richard Dawson, weenie, on "Family Feud"