New model \'permits time travel\'

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Quote:[...]
Quantum behaviour is governed by probabilities. Before something has actually been observed, there are a number of possibilities regarding its state. But once its state has been measured those possibilities shrink to one - uncertainty is eliminated.

So, if you know the present, you cannot change it. If, for example, you know your father is alive today, the laws of the quantum universe state that there is no possibility of him being killed in the past.
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From BBC: http://news.bbc.co.uk/2/hi/science/nature/4097258.stm

So, well, forget about going back in time to kill Hitler.
Unless you were in his room and you were the one that triggered the gun before teleporting back to present

[[JR]]

Thats a theory, yes.

[=D.C.L.I=Everest]

Makes sense, though. It\'s better than that nasty paradox.