Explanation: Negative news are mostly passed to prove a point, reason or fact over the other,or to have favour over the other fact. They are not shared to hide the main reason of the negative news. Mostly they are shared for people to be aware and appreciate good news.
I'd argue the nervous system because you sense pain through your nerves and when you realize something is poking you bam your nerves recognize it and tell your brain "UH OH CHEIF THERE'S A TACK" and you pull it out.
