The Story some of the 48 aliens have other special featu res- 42 of them have curly hairs on the top of their heads that change colors depending on their moods. 9 of the aliens have special knobs on their heads that allow them to sense other people's emotions. Only 3 of the aliens have neither of these.
Puzzle neither
aliens
curly hairs
knob
How many of the aliens have the knobs but not the curly hairs that change colors? 6.