Answer:
What is so delicate that saying its name breaks it?
I am heavy forward but backward I'm not.
I am the kind of an ant that's good at math. What am I?
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
I make you weak at the worst of all times. I keep you safe I keep you fine. I make your hands sweat and your heart grow cold. I visit the weak but seldom the bold.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.