The implementation of having Muggle Studies as a mandatory subject in Hogwarts was a huge success, at least in Tadashi's opinion. He was able to convince the school's headmistress to construct a structure a few paces outside of Hogsmeade where he could demonstrate the efficiency of muggle technology without them breaking down because of magic.

While Tadashi was loathed to do it, he had no choice but to employ the use of house-elves to complete the structure at the end of the school year after they started building the three-storey building, each floor built with rooms where he can showcase muggle technology and sciences to the students of Hogwarts in a safe and controlled environment.

Without magic ruining it all.

The only magical thing within the building was the fireplace, where Tadashi can transport his students to and from the building.

It was his second year teaching at Hogwarts, his students now were first-year Ravenclaws and Syltherins. This should be fun.

"Can someone tell me what colors fires have?" Tadashi asked his class.

"Pshh, that's easy, it's orange," A Slytherin scoffed. "My parents saw no reason why muggle studies as a subject was made mandatory for the students of Hogwarts."

"Incendio"

At the tip of Tadashi's wand showed a green flame, dancing in the wind.

This caught the attention of most of the class, even the Slytherin student that had scoffed earlier.

"Then class, what is the color of the flame you see?" Tadashi questioned the class.

"How!" A Ravenclaw student exclaimed. "There should be no such thing as green flames."

"Are you sure about that, Fronsac?" Tadashi raised an eyebrow.

"I do not know you did it sir, but there should be no such thing as green flames."

"Let's test theory, shall we?"

Tadashi transfigured seven branches into seven small silverwares that contain nothing in them. He then pointed his wand at each of those containers and lit them with different-colored flames, the colors of the rainbow.

"You must have used the confundus charm on us, sir." A cheeky Slytherin offered.

It was fortunate that the class was an hour-long, as he can regale these students, mostly ignorant of the advancement of science as a field. It was really lucky when a colleague passed by his classroom.

"Professor Fawcett," Tadashi called out. "Can I invite you to my class for a bit?"

"Sure thing, Professor Hamada."

"My students are claiming that I had charmed the classroom, or them for that matter, with a confundus charm," Tadashi explained. "Surprisingly, my first-year Ravenclaw class only has five muggle-borns with them; with all of them in the infirmary because of the food poisoning debacle last week and the half-bloods with them were largely raised in Wizarding society."

"I can see where this is going, Professor Hamada." Professor Fawcett smiled. "How can I be of assistance?"

"Cast a counterspell on the room, if you please."

"Surely."

"Finite Incantatem."

Professor Fawcett raised her wand pointed it at the room's ceiling and supposedly dispelled the confundus charm the Muggle Studies professor supposedly placed on the room. The counter-spell also exploded at the ceiling and showered the students of the same effects of the counter-spell.

"Now class, do you still see seven different colored flames?"

"How?!"

"Professor Fawcett, do you see seven different colored flames on the table?"

"Why yes, Professor Hamada, I do." Professor Fawcett nodded. "In fact, I see that all the colors of the rainbow are perfectly represented."

"Thank you, Professor Fawcett."

"Well, if that's all, Professor Hamada, I'll be on my way."

"Thank you for your assistance, Professor."

"Anytime."

Tadashi faced his students as he let them process what was happening.

"How?" Another Ravenclaw bravely asked.

"Well, Hilliard, you see different things burn differently," Tadashi answered. "Take for instance, this branch," The professor produced another tree branch from his person and placed it on the table. "They burn differently."

"Incendio"

The branch caught fire and produced a yellow-orange hue.

"As we can see, the common colors we see on fire are blue, orange, and red," Tadashi enumerated.

"Blue?"

"Look at the bottom of the fire." Tadashi gestured towards the flaming branch. "Isn't that the color blue?"

"Yes." The students nodded.

"If we burn something else, like say the powder we use to clean really dirty things, we'll get green flames," Tadashi explained. "If we burn one part of a battery we get a really red flame."

"But how did you change the fire's colors." A Ravenclaw asked curiously.

"We'll get there, but first I need to emphasize to you students about combustibility and flammability." Tadashi silently put out the fire on the branch. "Before we proceed with coloring our flames."

"Flammability?"

"It's whether how easy something catches fire."

"Just like the branch!"

"Correct!" Tadashi nodded. "However, there are more dangerous things in this world that are more flammable, and are therefore very dangerous to expose to fire, even one's that are miles away."

"That's absurd."

"Well then, let's go outside and see."


"Okay class, observe."

Tadashi brought his students to the edge of the lake. He transfigured a few boulders into couches and big chairs for his students to sit unto.

"Ventus"

Suddenly a putrid smell invaded everyone's noses and made attempts to at least lessen the effects of the odor on to their noses.

A breeze of air began to rise, relieving the students of the disgusting smell.

"Incendio"

As soon as Tadashi's spell was cast, the space above the Black Lake seemingly exploded and caused a large boom, startling everyone within Hogwarts.

"Professor Hamada! What was that?!"

The headmistress jumped down from her office, without a care whether it was dignified to just jump down from her window.

"It was a demonstration, Headmistress," Tadashi explained. "One of the many dangers if us Wizarding folk are to remain unaware of muggle society and their advancements."

"I… is that so?"

"That, class, is what will happen if you cast any spell that's related to fire in any way shape or form near anything flammable," Tadashi explained to his class. "While muggle society can find an explanation for such an event, like gas leaks and the like, saving us the headache from a violation of the statute of secrecy.

It is, however, life-threatening, to tolerate such ignorance of muggle society, as what we have just witnessed."

Everyone was shocked.

The headmistress and Professor Hamada's fellow teachers had been given an explanation and a small demonstration on the dangers of wizarding folk being largely ignorant of muggle society. It was still different seeing anything on the same scale as the explosion that happened above the Black Lake.

"Now, I want everyone to go back to the room and wait for me, Higgins, you are in charge."

Tadashi's students returned to their classroom, still processing what they had just witnessed.

"I'm sorry for such an explosive demonstration, headmistress." Tadashi bowed in apology.

"Is this how you managed to make flames in different colors, Professor Hamada?" Professor Fawcett asked.

"Yes." Tadashi nodded. "I simply think of the product that would be burning when I cast the fire-making charm and we have a differently colored flame as if it was burning the product I thought of."

"You summoned a highly flammable gas with the wind-making charm, didn't you?" Another professor deduced. "You did not expect to have a high concentration of those gases above the Black Lake."

"That's essentially what happened." Tadashi nodded.

"I have to admit, I hadn't thought of thinking of something other than the intended effect when I cast my spell." The same Professor hummed. "Although, achieving such a feat would only be possible if we are knowledgeable in muggle sciences as you are, Professor Hamada."

"I'm afraid so."

"Well then, with that sorted out, I implore everyone to go back to their classrooms and continue your classes." The headmistress ordered.