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Who am I?
One of my forms is killed when I'm young, by ramming into myself
But I live long after I die, seeking revenge
The less this world knows about me, the better
For I can heat up and kill in the form which killed the parent's of the temperature man!
Hint:
Antagonistic phenomenon of the question's title.
This could be
Any radioactive substance
I am killed when I'm young, by ramming into myself
radioactive decay starts as soon as the radioactive substance exists and is caused by nuclei bumping into one another
But I live long after I die, seeking revenge
It continues long after it starts
The less this world knows about me, the better
the energy released in the process is dangerous to humans
For I can heat up and kill in the form which killed the temperature man!
I'm not sure who this is talking about since Celsius died of Tuberculosis and Fahrenheit died of Mercury poisoning as far as I can tell.
