I can run constantly without ever getting tired. When I run, I frustrate people and drive them crazy, Yet I don't even have to move to irritate you. What am I?

Answer: I am a runny nose.

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I can sing, but I can't talk. I can climb a high tree, but can't run. I have very soft hair and a very hard mouth. What am I?
I can sizzle like bacon. I am made with an egg, I have plenty of backbone, but lack a good leg. I peel layers like onions, but still remain whole. I can be long, like a flagpole, yet fit in a hole. What am I?
I can speak with my hard metal tongue. But I cannot breathe, for I have no lung. What am I?
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word. What am I?
I can the same written do forward, backward, and upside down. What am I?
I can travel from there to here by disappearing, and here to there by reappearing. What am I?
I can wake you up in the morning but I require no electricity or winding. What am I?
I can wave my hands at you, but I never say goodbye. You are always cool when with me, even more so when I am high! What am I?
I can’t be seen, found, heard or smelled. I lie behind stars and under hills, I fill empty holes, come first and follow after. What am I?
I can’t go left, I can’t go right. I am forever stuck in a building over three stories high. What am I?
I can’t go right, I can’t go left. I’m forever stuck going only up and down. What am I?
I can't see yet I know your there. I'm not a cow but I'm leather. I'm a rare find but follow paths. I can fly but I'm not a bird. What am I?