Based on the output of the function f(x) for the given inputs, here is a description of what the function is doing:

[DESCRIPTION]: The function f(x) seems to be selective for concepts related to crystals and minerals. It returns a value close to 1 for inputs like "crystals" and "minerals", indicating a strong association with these concepts. On the other hand, it returns values close to 0 for inputs like "voice actors", "rhyme", "democracy", "France", "guilty", "helicopter", "Breaking Bad", and "Beverly Hills", suggesting a lack of association with these concepts.

Based on these results, it is likely that the function f(x) is specifically designed to identify or measure the presence of crystals and minerals. However, it is important to note that without further experimentation and analysis, we cannot make definitive conclusions about other concepts f(x) may be selective for.