Universe 25, also known as “Experiment 25” was an experiment conducted by American psychologist John Calhoun in the 1970s. The goal of the experiment was to study the effects of overpopulation on behavior animal.

John Calhoun was an ethologist and behavioral researcher who stood out for his studies on the behavioral effects produced by population density. During his studies he defined as “behavioral sink” the extreme behaviors produced in situations of overpopulation.

Calhoun built a series of mouse housing units, each with an initial population of 8 mice. The units were designed to provide the mice with everything they needed to survive, including food, water, shelter and space to reproduce.

The experiment lasted 31 generations of mice. At first, the mice reproduced rapidly and the population grew exponentially. However, as the population approached 2,200 mice, problems began to appear.

The mice became increasingly aggressive and violent, so the males fought for dominance and the females, who were harassed by the males, became passive and stopped caring for their young. The mice also became more apathetic and uninterested in reproduction and the younger ones became asocial and did not reproduce.

The population eventually stabilized at about 2,200 mice. However, the mouse society had collapsed. Most of the mice were solitary and avoided contact with others. Mice that were not sick or injured became increasingly autistic and disinterested in their surroundings.

Ultimately, the colony collapsed and the rats died of hunger, thirst or disease.

Calhoun concluded that overpopulation leads to social and psychological collapse, leading individuals to adopt violent and irrational behaviors in order to try to increase their survival options, turning them into asocial subjects.

Findings and implications of the experiment

• As the rat population increased, living space became increasingly limited, increasing competition for resources, generating conflicts between individuals.
• The rats became less active and more asocial, motivated by stress and lack of opportunities.
• Reproductive behavior was reduced, and even rats stopped caring for their offspring, decreasing the birth rate.
• The colony eventually collapsed, dying of hunger, thirst or disease.

Experiment 25 has important implications for human society, our planet, Earth has a current population of more than eight billion people and is expected to continue growing in the coming decades. If the human population continues to grow at this rate, it is possible that we could experience some of the problems observed in experiment 25.

For example, we may see an increase in violence, apathy and disinterest in reproduction, and there may even be a collapse of society, as governments would be unable to address the measures necessary to ensure basic care for their children. citizens related to education and health, for example. Likewise, social institutions will not be able to cope with the growing demand, lacking housing resources and vital basic necessities for many citizens, such as lack of housing, water scarcity, or the possible decrease in access to food.

Calhoun argued that the experiment showed that overpopulation can lead to social collapse, even in an ideal environment.

Experiment 25 has been criticized by some scientists, who argue that it is not an accurate representation of human behavior. Critics argue that mice are very different animals from humans and that their behaviors cannot be extrapolated to human society.

However, other scientists maintain that Experiment 25 is a important warning about the dangers of overpopulation and argue that the experiment demonstrates that overpopulation can lead individuals to psychological collapse, which can lead to the generation of serious social problems, even in species very different from humans.

Experiment 25 remains a topic of debate. Some experts believe that the results of the experiment are relevant to human society, while others believe that they are not.

The debate on experiment 25 is important because it has implications for the way we see overpopulation, thus, there are those who have taken advantage of the results of their experiment to address the need to take measures that allow control over the population, with the in order to maintain demographic growth within previously established parameters. However, in developed countries with greater population density in their territory, birth rates are decreasing, to the point that many of their societies are aging societies, in terms of the ages of their members.

Experiment 25 is a controversial experiment, but it is one that has had a significant impact on thinking about overpopulation. The experiment demonstrates that overpopulation can have devastating consequences for human society.

It is important to note that experiment 25 was conducted in an artificial environment. The mice in the experiment didn’t have to worry about food, water or shelter. In a society where the individual must work or seek sustenance, shelter and security, perhaps the results were more alarming or even occurred earlier, motivated by the increase in competition for resources to unbearable levels.

The results of the experiment suggest that overpopulation can have similar consequences in human society, even in the most favorable environments, perhaps due to the stress that the lack of free and quiet spaces can cause on the minds of individuals, after all. Nobody wants to be surrounded by people at all times of the day.

In any case, it is important to keep in mind the results evidenced by this experiment and be vigilant in our society, lest in the future we encounter situations that represent notable behavioral disorders, perhaps similar to those experienced by the mice in experiment 25.