"When I tried to find the constellations, the wingtip navigation lights and strobe lights did interfere with my vision," Xiaolan said slowly, "and when I was about to give up, I found a different kind of light in my peripheral vision. ”

"A different kind of light?" Mo Yuan repeated.

"Yes," Xiao Lan continued to say slowly, "I fixed my eyes on the location of the wingtips, and at some point, a flame ignited, emitting a blue-white light. ”

"Blue-white light ......" Mo Yuan's mouth opened slightly.

"Actually, to be precise, it shouldn't be described as 'a flame'", Xiaolan paused and lowered her head slightly, as if recalling the previous scene, "but like a floating and wandering soul...... Well, that's a better way to describe it. ”

"Soul...... Mo Yuan's mouth opened slightly, and slowly closed, "The ancients lacked scientific explanations for natural phenomena, so they pinned their hopes on God and used God to explain unknown things. ”

"What Professor Xun said is", Xiaolan admitted her mistake like a student, and the scene of the college era appeared in front of her, and then asked, "Does Professor Xun usually like to watch movies?"

"If it's a good movie, I'll watch it a few times, but I'm worried that I'll get into the play too deeply and delay my work, so I watch less now. ”

"Oh, next time I recommend you a movie, I love the heroine in it. ”

"Good. ”

"However, what is that strange flame emitting a blue-white light on the wingtips?" Xiao Lan couldn't help but ask.

"I think that's your hallucination. Mo Yuan replied calmly.

"No way, I'm well aware of my state of observation. Xiaolan said affirmatively.

"Actually, this phenomenon should have been described in the textbooks we have studied before", Mo Yuan reminded, "It's just that it belongs to the extended content and is not in the assessment." ”

"Academy ......" Xiaolan recalled slowly, her eyes flashing, "St. Elmo's Fire?"

"Hmm. ”

"No wonder you think it's an illusion," Xiao Lan said suddenly, "The fire of St. Elmo was caused by the ionization of the air in the field due to a strong electric field. ”

"Well, I know you'll remember. ”

"yes, sometimes, just a little hint is all it takes. ”

"Only when there is a very large electric potential difference in the surrounding environment, so strong that it exceeds the dielectric collapse voltage of the air, so that the air also becomes a conductor", Mo Yuan looked out of the porthole, "The light emitted during the conduction process is the blue-white flame you are talking about—the fire of St. Elmo." ”

"In nature, severe thunderstorms are excellent conditions," Xiaolan regretted slightly, "It's just that we are in the stratosphere, and if we are in the troposphere, it may be ......"

"Hmm. ”

"Is it really my hallucination?" Xiao Lan looked out of the porthole, her eyes glazed out, "It's real, not like an illusion." ”

"Is there any video recording?" asked Mo Yuan.

"No, the flames didn't last long, and by the time I realized it wasn't time to record, it was gone. Xiaolan lowered her eyelids and said regretfully.

"Hehe, actually, it's just a physical phenomenon, go back, we can reproduce it ourselves, there's nothing to regret......" Mo Yuan was a little puzzled, but still comforted, "What's more, we have more important speeches to do, and we shouldn't have any regrets for such a trivial matter, discussing a physical phenomenon like this is like two nerds......"

"I just thought that phenomenon was interesting and wanted to share it with you, but I didn't think about it, but it was an illusion......" Xiaolan sighed softly and stared blankly ahead, without focus.

Facing Xiaolan's sigh, Mo Yuan didn't know how to deal with it for a while. At the same time, he felt that this situation and this scene were familiar, but to a different extent.

"Sentimentality, it's not my style, I didn't expect you to have a trace of hesitation, are you thinking about how to comfort me?" Xiao Lan showed a professional smile like a flight attendant, staring directly into Mo Yuan's eyes, and her tone was gentle and serious, "No one will change their nature for the sake of another person, if they do, then they are close to destruction." ”

Mo Yuan stared at Xiao Lan blankly, looking at the professional smile of the flight attendant, and suddenly felt that he was bumped into his arms, the moment of the collision, the Xiao Lan in front of him, the seat he was sitting on, and the cabin, all of them were shattered and disintegrated like pieces of paper, after a gust of wind, he stood on the empty flat ground, surrounded by barrenness, the sky was unusually bright, he turned his head, the person who hit him was facing away from him, away from him.

He knew him.

He remembered what he had said, "Don't wake me up too early, I'm annoying people disturbing my dreams." ”

Mo Yuan looked at the gradually blurred back slowly blending into the horizon in the distance, the whole world, leaving only himself.

Suddenly, he heard the sound of glass breaking, coming from the sky, and he looked up, only to see countless broken glasses, fluttering, spinning, colliding, combined, turning into portholes, through those portholes, the blue-white flames were clearly burning on the wingtips.

"Professor Xun, what are you looking at, so focused? Otherwise, I'll give you the seat by the porthole, how inconvenient it is for you to stretch your neck so far to see", Xiaolan quipped, "You have a point, the stratosphere, it is unlikely that the fire of St. Elmo will appear, it should be my hallucination." ”

"Actually, in the stratosphere, there are fewer turbulences," Mo Yuan replied, "Since, just now, when I woke up, you told me that I encountered air currents, presumably the flight attendant explained it to the passengers...... You know, no matter what the reason for the shaking and bumping, in order to avoid the passengers' unnecessary panic, the flight attendant will say that it is encountered by the airflow, so maybe it is really because of some unknown reason...... In that case, the fire of St. Elmo is not completely impossible......"

"When we go back, we can investigate again, if we are still interested at that time," Xiaolan suggested, "After all, our school still has a lot of investigative methods." ”

"That's right. Mo Yuan nodded.

-

"Ladies and gentlemen: the plane is descending. Please sit back in your seat, fasten your seat belt, put away the small landing board, and adjust the seat back to the normal position. All personal computers and electronic devices must be turned off. Please make sure that your carry-on items are properly stored. Later, we will dim the cabin lights. Thank you!"

-

"Ladies and gentlemen, the plane has landed at the first airport of S, the capital of country A, the ground temperature is 27 degrees Celsius, the plane is taxiing, for your safety and the safety of others, please do not stand up or open the luggage compartment just yet. When the plane is fully stopped, please unbuckle your seat belt and pack your belongings before getting off the plane. Please be safe when picking up items from the luggage compartment. Please collect your baggage at the baggage claim area. Passengers who need to transfer to other places at this station should go to the transfer cabinet in the waiting room. Thank you for choosing CA Airlines! See you next time!"

-

Airport exits.

"When we arrived at the hotel, we arranged our luggage, checked the room, and then went to ......the scene to investigate as planned," Xiaolan said softly to Mo Yuan, and her eyes suddenly turned to the distance.

I saw a neatly dressed man with messy hair and stubble on his face, holding a sign that said "Welcome Professor Xun of SU University", standing not far away.

"Uninvited guest?" Mo Yuan confirmed softly but clearly in an extremely fast voice.

"Hmm. ”