71% of the earth's surface is........

Yes...doesn't make a lot of sense...

Except, they aren't aliens...they are demons. That is why they have no technology and can't open doors (you have to let them in).

And the water that the daughter touches isn't water, its Holy Water because she is an angle.

If you go back and watch the movie again, keeping what I've just said in mind, you'll see clues to this all over the place.

Signs isn't a movie about an alien invasion, its about faith.

Can you explain what's the significance of what you said, it's been a long time since i saw this movie and I don't understand

That and the fact that they are easily defeated by baseball bats.