"Oh look rocks!"

Rainbow Dash said , pointing sarcastically at the rocky valley. Of course, there was nothing but rocks since the Mane Six were all together in a geologist expedition. Twilight´s idea, of course. They walked along the tourist group to hear a professor giving a lecture about the different types of rocks that could be found on this valley. Out of the six the only two that showed any kind of real interest were Twilight and Rarity; Rainbow was pretty bored, Applejack had fallen asleep over Fluttershy shoulder and Pinkie Pie was her usual carefree self.

"...and this type of rock here comes from the Pre-discordian era." the professor said.

"Excuse me, Mr. Professor but you´re wrong. They are from the post-discordian, do notice the rounded tips caused by residual chaos magic." a voice said.

All the looks moved over to Twilight but amazingly it wasn´t hers; it was Pinkie the one who talked.

"Oh yes, you´re right child. May I ask your name?"

"Sure you can! I´m Pinkie Pie!"

"Uh Pinkie Pie...as in Doctor Pinkamena Diane Pie?!"

"Eeeyup!"

"Doctor? Since when you´re a doctor?" Rainbow Dash asked.

"I have a P.h.D in Geology." she explained.

"...so you´re not a doctor then."

Rainbow decided to ignore all the angry looks she was getting from all the presents students and geologist.

Soon Pinkie Pie was surrounded by an enthusiastic crowd of rocks admirers, she answered all their questions, showing an impressive amount of knowledge.

"I have no idea that Pinkie was a doctor. She never said anything about it." Fluttershy said.

"She is not a doctor...." a snarky pegasus murmured.

"Well darling, do remember she grew up in a rock farm." Rarity added.

Two mares had nothing to say, Applejack, because she was still snoring; and Twilight who silently move away from the crowd.

A few minutes later Pinkie found her, sitting under a tall rock.

"Hey grapey candy, there you are!" she said jumping to hug her but Twilight moved her head away. "What´s wrong?"

"Why didn´t you tell me? Why did you hide something so important from me?" she answered.

"Uh I wasn´t hiding anything I just...well, forgot about it."

"How can you forget something some important?"

"The same way I forgot to tell you your mother is in the train station?" Pinkie said, looking at a note under her left hoof. "Are you...mad at me, Twilight?"

"I´m not mad...and I´m certainly not jealous is that what you´re thinking. I´m just...frustrated. Why aren´t you here, doing research instead of wasting time in that bakery?"

"But I like being in the bakery!"

"But Pinkie, you have a gift! I heard you talking, you´re incredibly smart! Why waste that intelligence just throwing parties?"

"Because to me making ponies happy is more important that just knowing stuff." Pinkie said, looking completely serious.

"You don´t understand anything about science."

"And you don´t understand anything about being happy." and Pinkie Pie left.

Twilight remained there for a few minutes. She hated her big mouth and hated hurting Pinkie´s feelings. But she just couldn´t understand, in her list of priorities studying was over partying but Pinkie was different. She couldn´t force her ideas on her. Twilight facehoofed, she was a terrible marefriend at times. Note to self: buy some chocolates to apologize. No better yet, make some chocolates to apologize.

Twilight went back with the group and was witness of a funny scene.

"Jeez Rares, a rock. That´s...nice." Applejack said, trying her best to lie.

"Just take it, Applejack. And now rub it with your hooves." Rarity said.

"Like this?" after a few seconds the rock crumble revealing a beautiful set of shining stones. "Oh...nelly."

"Allow me." and Rarity levitated the gems, placing them in Applejack´s ear as improvised earrings, taking the chance to wink at Pinkie who suggested the present. Above her, Rainbow Dash brought Fluttershy closer.

Seeing the happiness on Applejack´s face, Twilight finally understood. She smiled at Pinkie who smiled back. Their relationship may have some ups and downs but in the end, it was truly sturdy as a rock.

"So Pinkie...” Rainbow said. “you´re not really a doctor, right?"