The discovery of the "Tesla" parasite gave Todd a new breakthrough in microbiology and also provided him with new ideas for laboratory equipment.

The optical microscope currently in the laboratory is the second microscope he made (the first one was given to Tristan). It has a maximum magnification of 400x, and when combined with the "Eagle Eye" ability, the magnification can reach 2500x.

This magnification level of the microscope allows observation of bacteria and chromosomes (which requires staining with gentian violet or acetocarmine solution), but optical microscopes are ineffective at observing smaller substances such as viruses; an electron microscope is required to visualize them.

Since viruses are generally 30-80 nanometers in size, they can be observed with the naked eye by magnification if you just want to see them. However, if the viruses are clustered together, you need to magnify them 50,000 to 100,000 times to effectively observe individual viruses. If you want to clearly identify the morphology of the virus, it is better to magnify it 100,000 to 150,000 times.

The discovery of the "Tesla" parasite provided Todd with the basic materials for manufacturing electron microscopes.

Due to the extreme difficulty in manufacturing equipment such as the 'transmission electron microscope' and the 'scanning tunneling microscope', the materials science and engineering technology of Muxi Town had not yet reached the corresponding level. Todd had to focus on the most basic and simplest 'magnetic electron microscope' for equipment manufacturing.

The magneto-electron microscope, the most basic type of electron microscope, was invented by Hans Bush in 1926. Its principle can be described in simple terms: First, a shell with an inner annular gap is created, made of a soft magnetic material (pure iron or low-carbon steel). Then, an electromagnetic coil is built inside. When the coil is energized, electrons move along the coil's axis, gradually generating a magnetic field. As the current increases, the magnetic field strength strengthens, and the pattern focused by the electromagnetic lens becomes increasingly clear. The sample under the viewing microscope is magnified and displayed in the eyepiece.

That's the main principle. As for other components and theories, such as vacuum pumps, diffusion pumps and vacuum valves, evacuation pipes, material slicers, as well as the wave-particle duality of light, Lorentz force, electromagnetic induction, and osmium tetroxide staining theory, I won't go into detail here.

Now let's talk about the materials for electron microscopes. The most crucial electromagnetic coil can be replaced by the 'Tesla' parasite, but the creation of the soft magnetic material shell and the electromagnetic lens requires the joint efforts of all the scholars, craftsmen, and aliens in Muxi Town.

After examining Cosette's body and instructing her to discharge an appropriate amount of electricity each day according to her internal condition, Todd convened a technical conference at the Knights' headquarters specifically for the manufacture of the magnetic electron microscope. The attendees included Brother Joe, Ulysses, Lynn, Old Aiden, and Rachel.

After nearly two hours of explanation, the attendees whispered among themselves and gave Todd an answer that left him devastated.

"Commander-in-Chief, we don't understand what you're saying..."

When Todd perked up and asked the others again what he didn't understand, he did.

The people below the stage looked at each other in bewilderment, and then received another answer that left him in despair.

"We haven't understood anything since you started talking about electricity and magnetism..."

Todd slapped his face hard with his right hand, looking utterly dejected. Only then did he realize that the true concept of electric current was proposed by the American scientist Benjamin Franklin in 1732; and that the summary and generalization of electromagnetic phenomena was done by Maxwell in the second half of the 19th century.

To expect these medieval people to learn and understand electromagnetic theory in just two hours is nothing short of a pipe dream.

"Commander-in-Chief, I've heard someone mention electricity and magnetism before." Ulysses's words brought a glimmer of hope to Todd, whose spirits had sunk to rock bottom.

"Tell me quickly, who is it?"

“Abu Ben Sabah Kendi”.

Upon entering the conference room at the Knights' headquarters and seeing the electromagnetic model and calculation formulas drawn on the wooden board, Kendi's eyes looked like those of a leopard spotting its prey in the night.

The excited Abbasid scholar pointed at the wooden board and uttered a string of Arabic.

Todd frowned and began to talk to him about the principles of electromagnetism in the Common Language, becoming more and more alarmed as they talked.

Kendi said his friend had proposed a similar theory, though not as complete and rigorous. These southerners used to rub fur products with metal and glass together, producing sparks that could ignite scraps of paper. They even gave this crackling flash an Arabic name—'raad,' meaning lightning.

As Todd watched Kendi speak eloquently, he finally remembered that in his previous life during the Middle Ages, the Arabs were indeed the first group to understand the nature of lightning; they recognized other sources of electricity before other groups. In the late 14th and early 15th centuries, they even wrote works on the analysis of electrical and magnetic energy, but unfortunately, these were lost in later wars.

Todd and Kendi talked for almost an hour. To Todd was pleasantly surprised that Kendi's understanding of electrical and magnetic energy, while containing some errors, consisted mostly of bold assumptions and reasoning that came close to the truth.

Todd eventually formed a manufacturing team for the "Magnetic Electron Microscope," with Kendy as the team leader, Ulysses, Lynn, and the students joining as researchers. The monks were responsible for finding and providing books, Rachel was responsible for providing supernatural support during the manufacturing process, and old Aiden was in charge of the manufacturing engineering.

A handwritten document was prepared, requesting Queen Mary, the administrator of the Holy Treasury, to fully support the manufacturing team's work. Todd then signed his name and affixed the Knights' seal. Leaving behind a room full of people engaged in discussion and debate, the Grand Master of the Knights had another important task to attend to.

The cargo ship carrying seafood from Beidao Island arrived at the west coast of Muxi.

These large cargo ships, flying the flags of the Claw and Blackskull tribes, drew the attention of the defense forces of Twilight Town. Alfonso led the Twilight Town guards to the beach immediately and, without a word, surrounded the North Island pirates responsible for delivering the goods.

After a half-hour standoff, Todd's timely arrival finally eased the tension between the two sides.

On one hand, he sent Alfonso with the alien soldiers to retrieve the 'frozen' dormice from the warehouse behind the experimental building; on the other hand, Todd chatted with Morgan, who was in charge of delivery, and the Claw Warriors.

The seafood shipment filled five large ships, totaling 129 tons. In addition to the goods themselves, the people of Beidao had also stockpiled a large amount of ice in the cargo holds to keep it fresh, but almost all of it has now melted. If they don't install a "bacterial cold storage" system, all their efforts will be wasted if the seafood spoils and rots.

Todd first explained to Morgan the intention of purchasing grain from Muxi Town, then directed the soldiers of Muxi Town to place the dormouse cages in the cabin, and finally told the North Islanders how to use the "cold storage" and the precautions.

After a long day of work, watching the five North Island cargo ships set sail again towards the south, Todd took a deep breath. He thought to himself, whether or not the trade route between North Island, Muxi Town, and the Southern Empire could be opened up depends on the outcome of this fleet.