Bark?

By the time that Sunset had reached the library, she had pulled herself together. Fixing her mane, she took a few deep breaths and pulled the library doors open. Not even as the door was all the way open, a frail old unicorn popped up.

"Sunset, dearie! Long time no see! Come in! What books would you like to read?"

"Hello, Fluffy Diamond. I guess it has been a long time." Sunset smiled. I was just here three days ago. Her memory must be getting worse. "Celestia had given me this book on a theory about space traveling. I was wondering if you had any books on alternate universes."

A grin appeared on the old pony's face. "Yes, right this way!"

The two walked down the long, thin, pathways in between bookshelves that were jammed pack with books upon books. The books had colorful spines, proudly bearing their name and the author who gave life to them. Other books, as Sunset observed, had broken spines, their color was fading, and the print was peeling. They must have been popular books.

"Right here, these three shelves have books on alternate worlds. " Fluffy Diamond began pulling books off of the shelve. Turning to Sunset she asked, "School project?"

"Yes," Sunset quickly said. No pony needed to know what it was really for. Fluffy Unicorn would fall for it, she probably doesn't remember that I have graduated.

"Are you lying to me, missy? I remember your graduation. Class of 2015. You were 15 years old. Top of your class."

"Actually, Fluffy Diamond, Twilight was." Sunset corrected. She immediately regretted in doing so because the old unicorn started rambling off about the newest alicorn princess. Sunset sat there, not wanting to take a risk of being disrespectful again, especially to the one pony that seemed to care. However, she did have reading to get too. "Look. I have some reading to do. I would love to talk another time."

Fluffy Diamond just kept on talking and talking. No matter how many times Sunset tried, it was like she couldn't be heard. "Ok... well, I gotta go now. Bye."

Sunset walked off to a desk, once again saddened by the fact that everypony loved Twilight. Behind her, several books followed, flying in mid-air, with a blue sparkly tinge to them. She sat down, and the books plopped on to the desk. "There was something about humans," Sunset said aloud, remembering back to when she learned about alternate universes in school. Flipping through the thin pages of the first book, she looked for the word human.

"Human. Human. Human. Human. Human" she repeated to herself. The book had many words, but not the magic word she was looking for. While searching, Sunset could hear the faint voice of Fluffy Diamond, talking a few aisles down, her voice was like an old record, that had been played many times, in the distance.

"Human. Human. Human."

Sunset continued looking. It was not until the last book that she found the word. "HUMAN!" she yelled, relieved that she was down looking.

Fluffy Diamond had stopped yapping, now her old crackly voice yelled back, "QUIET!"

"Sorry" the exited unicorn whispered. Sunset began reading the chapter on this particular world.

One of the best known to Equestria, alternate worlds is the human world. This is a world where you have legs and hands. They have many strange tools, like a computure.

To get to this alternate world, you must go through a portal. This portal is a mirror and only opens once every 30 moons.

"The full moon," Sunset said, her hoof slightly raised to her head. "That's tomorrow!" Her hoof slammed down on the table, causing the stack of books to crumble into a pile.

"QUIET!" Fluffy Diamond yelled again.

Sunset Shimmer rushed over to the old librarian. "Fluffy Diamond. I have a question, about the mirror portal. Do you know anything about it?"

"Well....", she started.