As science fiction, "Signs" is idiotic. From a pure science standpoint the idea of aliens who are destroyed by water is a blatant violation of the immutable laws of physics, which are the same on every planet. Any astrophycist who past 5th grade will tell there are two thing necessary to support life: Water, and energy.
Hehe, then you take collgiate astrophysics and learn that the reason physiscists argue all of the time is because they disagree on these immutable laws.
Quantum tunneling came from the discovery that the sun is temperature is off for how fast the atoms are moving inside. Therefore they must just be jumping around without actually moving.
The scientists at ground zero for the first nuclear warhead were taking bets for whether or not they would start a fuse that would actually ignite the entire world. They decided it wouldn't. But if cold fusion were possible, it would have fused, and ignited the next atom, which would ignite the next would would etc......
Hehehe. when you get down to it, we really know nothing of physics. Ask a scientist or a professor.
This is a good one:
So, an object will do exactly what it did 5 seconds ago unless something acted on it. Everything was together (even time and space) before the big bang. What acted on the infinite mass to make it blow up?
"We don't know"
some physics we have not discovered?
Who knows.