When the people on the ground responded to the call of various governments and formed a large army to migrate to the underground Light Continent, the Light Continent Science City, located under the Grand Canyon of Colorado and 3,000 kilometers away from the Joint Military Committee of the Space Force, always maintained the desertion of the past, as if whether it was a small matter of a snowflake falling from the sky or a major event of volcanoes erupting all over the world, it had nothing to do with it, it was just a guest from an unknown universe, and it did not have to come into direct contact with humans.

But actually, in Powell. In the more than 20 years since Du Wen's death, it has become the driving force for the rapid development of all science and technology in the Light Continent, from solid-state photosynthesis to mass production of photosynthesis, every step is led by the Science and Technology Union in Science City. It is precisely because of the existence of this technology-themed city that the continent of light can enter the AI era predicted by Hawking in advance, that is, the era of the fourth industrial revolution of mankind.

Science City is also the earliest city established on the continent of light, although the light will not get old, the light emitted by the buildings in the city is still slightly dim compared to the new city, and the architectural form is not much innovative, from the shape of the building, it is closer to the ground style than the oval space-style buildings of the big city.

Covering an area of about 500 hectares, the old city is divided into three major areas according to its practical use: industrial area, agricultural area and military equipment research and development area.

Needless to say, the industrial zone is as large as the design of the urban building life system, and as small as a teacup for human beings living in the Light Continent, the research and development content is all-encompassing. And since more than ten years ago, it has been determined that aliens will launch a war of aggression, and the ground people will soon move into the underground world en masse, the research and development personnel have received an urgent task: to quickly design ordinary clothing other than solid-state light military uniforms, the style does not matter, the key is that it must be as close to the human body as skin, but it must not cause discomfort, otherwise there will definitely be civilians who will risk taking it off in an absolute zero environment.

A few years later, C&T published the results of its gratifying research and quickly sent production guidelines to all the military factories on the mainland, so the garment production departments of these factories immediately converted part of their production lines from military to civilian use, specializing in the production of civilian solid-state light tights.

After another two years, when the leaders of all the world's governments stood on Ayers Rock and joined hands in a circle, the inventory of solid-state light protection suits for ordinary people exceeded 10 billion pieces. The fact that such large-scale production can be completed in such a short period of time and only using only a part of the production line shows the high efficiency of the AI-controlled garment workshop.

Side by side with the industrial zone is the military equipment research and development zone. The name of this region doesn't sound like anything special, but in fact, if you learn that it was the Optical Flow Shuttle, the Capsule Tram, and later the Alpha, Gamma, and Beta, all of which were born from this area, you have to be impressed by it.

Scott, who fought alongside Shen Yun at the United Nations. Lennon, right in the city. After returning from the United Nations, he plunged into the laboratory with the R&D team that had followed him for many years, and it was rare to show up for many days, and it seemed that it would not be long before a new invention would come out that shocked the world.

The largest area of the City of Science is naturally the agricultural area.

Due to the geological conditions of the underground world, most of the above-ground plants cannot grow in the light continent, even if agricultural scientists adjust the greenhouse environment to the ground and use artificial sunlight to continuously photosynthesize crops, it still has little effect.

After sowing the seeds for one season, they can indeed harvest a little grain, but these rice and ears of wheat are not only small grains, many of them are still empty husks, and if they are barely enough to supply the army as military food, it is a fool's dream to feed six billion people at the same time.

There are all kinds of science and technology that electronic interstellar spies can steal from aliens, from military to industrial, and continue to help humanity move forward, but they can't find any information related to agriculture. It's no wonder that those monogranular organisms that don't even have stomachs grow food for whom?

But scientists have not given up research because of this, knowing that if they admit defeat, the entire continent of light will cease to exist - without food, human beings cannot survive, so what is the point of vigorously developing high-tech products and armaments?

When people were confused and thought that they would never be able to get out of this dead end, and the construction of the Light Continent would be blown up due to food shortages, an agricultural expert from the desert reminded everyone that weeds and trees can also grow in the cracks of the rocks, why don't we think beyond the existing crops on the ground, and try to use hybridization to cultivate staple foods and seasonal fresh vegetables suitable for the natural environment of the Light Continent?

This idea has given hope to many people. Aside from the extreme pessimists, scientists were eager to try it and immediately set about new experiments. After ten years of painstaking research, the older generation of experts provided a theoretical basis for the new crop by studying various hybrids, while the new generation of experts cultivated extensively on rocky ground with subtle differences, and finally cultivated a grain that could grow in mechanically crushed peridotite grains - iron rice.

This rice grows fast and yields well, with a sowing and ripening cycle of only three months, and a bumper harvest after three months. And it does not need a lot of fertilizer, as long as it absorbs enough water and a certain amount of artificial light every day.

The only drawback is that even if the iron rice is removed from the chaff, the rice grains inside are veritably as hard as iron, and it is okay to use them as bullets to hit the enemy, and if you want to use them to make a pot of white porridge, I am afraid you will have to wait for ten or eight years.

Immediately after the iron rice, similar "iron vegetables", "iron fruits", "iron tea and iron coffee" have also come out, but unfortunately they are the same as iron rice, all of them are extremely hard, unless they are mechanically milled, otherwise human beings bite with their teeth, and only the big teeth will be broken.

Interestingly, the analysis found that the nutrient content of these crops is at least ten times higher than that of above-ground crops, so they are not only harmless to humans, but also very likely to help the organism avoid disease and become stronger.

This is a direct human innovation, and scientists are so excited that they are racking their brains again to think about how to overcome the only flaw of the "iron crop" - hardness.

The result of a long period of thinking and discussion is the birth of the Li Nengsu that can be trusted on the Light Continent, and since then, the underground people have not only taken in more nutrients and healthier bodies than the people on the ground, but also saved a lot of cooking time and made life more convenient.

Of course, when the ordinary ground residents move down, whether they can get used to the days when the ten fingers no longer need to be touched by the spring water is another matter.