Answer:
It describes an era in history during which lights was hard to come by.
Who is never hungry on Christmas Day?
There is a kind of fish that can never swim. What is that?
It increases and decreases yet no one see it. It is not a fire and yet it can be quenched.
When set loose I fly away. Never so cursed as when I go astray
People take me on walks and I run and have fun. What am I?
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?