[DESCRIPTION]: The function f(x) seems to be selective for concepts related to education, knowledge, or intellectual topics. For example, the words "book" (0.9707), "scientist" (0.0610), "nucleus" (0.2337), and "atom" (0.1192) have higher output values closer to 1. On the other hand, words related to emotions, nature, and other categories tend to have lower output values. Note that the function might not be exclusively selective for educational/intellectual concepts, as there are also some other words with higher output values that are not necessarily related to this category.