The conversation between human and AI assistant.
What can we see once in a second, once in a minute, once in a year, once in a century and once in a thousand years?
I was wondering, do you know the answer to a riddle? What can we see once in a second, once in a minute, once in a year, once in a century and once in a thousand years?
Yes, I do. The answer is the letter 'E'.