I have been burning for billions of years, yet nobody calls me a fire hazard.

What walks on four legs in the morn- wait, what do you mean you've heard that one before? Have you been talking to Oedipus? Alright, smartypants, then how's this for a riddle: Who am I?

Where dust and dog-eared secrets lie, a quiet keeper up high. Wood or metal, it's no elf, holds the tales on itself.

I am useful until I hit the floor, then I’m everyone’s problem.

There was once an old movie about a brave little version of me. For anyone born after 1990, I'm what cooks toast with your coffee.