Eh, time is an illusion anyways, but still...
Science hopes to change events that have already occurred:
"Common sense tells us that influencing the past is impossible -- what's done is done, right?
...Such are the perils of retrocausality, the idea that the present can affect the past, and the future can affect the present. Strange as it sounds, retrocausality is perfectly permissible within the known laws of nature. It has been debated for decades, mostly in the realm of philosophy and quantum physics. Trouble is, nobody has done the experiment to show it happens in the real world, so the door remains wide open for a demonstration.
It might even happen soon. Researchers are on the verge of experiments that will finally hold retrocausality's feet to the fire by attempting to send a signal to the past. What's more, they need not invoke black holes, wormholes, extra dimensions or other exotic implements of time travel. It should all be doable with the help of a state-of-the-art optics workbench and the bizarre yet familiar tricks of quantum particles. If retrocausality is confirmed -- and that is a huge if -- it would overturn our most cherished notions about the nature of cause and effect and how the universe works. "
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