I don't have a system but I have a hammer

"I didn't expect you to know this!"

Erha looked at me in surprise, then nodded appreciatively...

"Oh, it seems that you have not spent these 100 years in this virtual space in vain. Yes, every living thing has its own biological light. Some developed civilizations that have done research on it will call it biological light. Photons, or bioluminescence, or bioelectricity, but normal people, no, even intelligent races with night vision capabilities, cannot catch it with the naked eye..."

Facing my suddenly enlightened gaze, Erha pointed to his chest and said with all his heart...

"Because bioluminescence is not on the surface of a living thing, but inside the living body, your human religious sects have a term called endoscopic vision, which refers to the ability to close your eyes and observe the inner parts of your body. Although I don't know if you humans can really can do this, but bioluminescence... does exist!"

“We still don’t know the origin of bioluminescence, but most civilizations believe that bioluminescence is mainly related to chemical reactions in organisms. For example, reactive oxygen species generated during cellular respiration will lead to the emergence of bioluminescence. In addition, when living things are thinking or when they are concentrating on something, they will also produce bioluminescence..."

I added thoughtfully...

"Like meditation?"

"right…"

Erha nodded and agreed with my statement...

"And often in this state of concentration, the biological light will be brighter than in other situations, and will even change various colors as the concentration gradually deepens..."

"But how can this be used as an energy source?"

Although Erha's explanation is very clear, due to cultural and cognitive limitations, I can't imagine the connection between biolight and energy. The only possibility is...

"Could it be that... light can generate electricity? But with this little light, how many living creatures are needed to make a light bulb light up?"

"Haha, do you understand light?"

"what?"

Erha's words directly confused me, because there is a special explanation of light in the school textbook, but since she asked this question, it was obviously not as simple as I thought, so after hesitation, I could only Humbly ask…

"Tell me..."

"It turns out there is something you, the Yin King, don't understand..."

While joking, Erha was already sitting upright, looking like a female scholar who was ready to discuss body art...

"What we generally call light is something with wave properties such as frequency, so you can understand light as an electromagnetic wave with various wavelengths. Let's talk about a concept that may be beyond your human cognition, color..."

She raised her gray arms...

"My skin used to be fiery red, but after I changed my body, my skin color turned gray. But this is just what we see. In fact, no one knows what color my skin is, because …”

"Color is a concept that we arbitrarily distinguish in the brain based on the wavelength of light. In other words, color is not something that exists in nature. It only exists in the eyes of intelligent creatures. After all, color has always been determined by our naked eyes. The wavelength of light that can be captured determines..."

"For example, the shorter the wavelength of light, the bluer the color, and the longer the wavelength, the redder the color. Therefore, the so-called colors of intelligent creatures are actually just our own fantasies. From this, an extremely terrifying concept will be derived. Reality What is the world like? None of us know..."

With a meaningful smile, Erha was like an old man drinking tea calmly after telling a horror novel, and pointed to his eyes with a calm expression...

"In fact, the wavelength of light that can be captured by the naked eye ranges from purple to red. According to your human calculation units, it is about 400 to 700 nanometers. Light with a wavelength shorter than 400 nanometers is what you humans call ultraviolet rays. , and those with wavelengths longer than 700 nanometers are so-called infrared rays, but we cannot see these two types of light at all, so many civilized scientists have speculated that since infrared rays and ultraviolet rays can only be captured by electronic instruments, are they biological light? Is this the case? So they started experimenting, and it turned out that they were right, so..."

Erha used her nails to cut open the skin of her arm. Although not a drop of blood was left, the structure was clearly visible. At the same time, she held it up in front of me without caring...

"Biological light has been captured for the first time since it was proposed! But its definition is quite controversial. Some people think that it is not light, but just a heat signal. Some people think that it belongs to the category of biological particles. In short, there are different opinions. Finally one day, a scientist defined it..."

As if thinking about what to say, Erha paused for two or three seconds before suddenly pointing at my chest...

"According to human light theory, in your system, light is only part of the electromagnetic spectrum, but the electromagnetic spectrum also includes radio waves, microwaves, television waves, radar waves, gamma ray waves, etc..."

"So electromagnetic waves are like notes in music, which exist in various forms, such as tones. The shorter the wavelength of light, the higher the pitch, and the bluer the color. The longer the wavelength of light, the lower the pitch, and the redder the color. , you may ask, why should I say this concept again?”

"Because as I told you at the beginning, biological light will sometimes be bright and sometimes dim, sometimes turn from white to blue, sometimes from black to red, depending on different circumstances. Is this characteristic consistent with electromagnetic waves? so…"

Facing my suddenly bright eyes, Erha stroked his healed virtual arm, smiled and nodded...

"That scientist proved that the so-called biological light is actually a kind of electromagnetic wave!"