Answer:
What is so delicate that saying its name breaks it?
A defendant will go free if a reasonable amount of this exists.
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
A standard dimension for sandwiches and rulers
Tickle with your fingers and a song it will sing. Be careful, though, you may break a string. What is it?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.