Answer:
A squiggly line tells you when you've done it wrong
What travels from coast to coast without ever moving?
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
Sometimes you feel it weigh a ton. Yet it is nothing, but somehow still there. Makes you uncomfortable around anyone, But speak its name and it's gone.
Makes apples fall from trees
People take me on walks and I run and have fun. What am I?