Kaleea,
you have made a mistake, you can observe that time isn't going backwards for its is proven by philosophically that it is going forwards. We observe it going onwards so it is impossible to go backwards. See my commentaries with Old Guy about imposiblity being possible. Time rolls on, this thread too, it can't go in the negative. As far as dog whistle even though you don't hear it it is observable, we know a sound is coming out of it by the way the dog reacts, so we know it produces sound regardless of our inability to hear it.By obsering elephant behavior we could see they hear each other miles away, this is too observable. I don't see a way for us to observe that the time is running backwards 9Philosophically speaking again, not time as a measure which goes nowhere but an abstract time, our experiences.)
Muser