Answer:
Securing your documents is easy with these trusty metal objects
One am I, among six others: Largest, smallest, cold, dark and two brothers
You could do this to a motion, see it on a watch, or place this in a race.
Prior to smartphones, people used this to record their lives.
It can be clear like water, but it burns like fire.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?