Answer:
What can be heard in court or used to carry briefs?
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
I am a king who's good at measuring stuff. What am I?
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
I can wake you up in the morning but I require no electricity or winding. What am I?
I'm the source of all emotion but I'm caged in a white prison.