Answer:
What freezes after it is heated up?
Longer than a decade and shorter than a milennium
A job that involves sitting in a highchair, wearing a black gown and smacking things with a mallet
Securing your documents is easy with these trusty metal objects
What is as light as a feather, but not even the strongest man on earth can't hold it for more than 1 c)minute?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.