Answer:
It describes an era in history during which lights was hard to come by.
What kind of car runs on leaves?
Why are foot injuries so serious?
What has a tongue but no mouth?
In buckles or lace, they help set the pace. The farther you go, the thinner they grow.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?