Why does negativity spread faster than positivity?

Apulu_3
Like if you notice then News Channels are always updated about criminal stuff like murder, kidnap and all but when something positive happens then no News Channel is really interested in making it's report. The positive News stays underrated. This is just an example but in reality why are people more curious about negative things rather than positive things? Like suppose I bring Full marks in maths test then my parents won't be that interested and will probably forget after 2 days. They will only say "Good job" but when I fail in maths test they will remember it for whole life and will give me lectures for whole month. Again this is just an example not a question. My question is 'Why negativity attracts people more than positivity?'
Why does negativity spread faster than positivity?
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