Covid-19, a highly infectious respiratory disease, has been brought to attention worldwide over the last several years. By January 2023, there has been 670 million cases across the globe, with 6.82 million deaths throughout [1]. In this paper, the authors will devise a mathematical model with the purpose of predicting Covid-19 cases in the year 2025-27. The main objective of this paper is to create a model suitable for data from 2020 up until now factoring all possible affectants. 

In this essay, we present a mathematical model aimed at predicting the number of Covid-19 cases in the year 2023-25. The main goal is to create a line graph showing the number of cumulative cases, projected from the data we have from 2020 up to now. All citations are placed beside the paragraph where relevant information is used.

With the development of science and technology and the improvement of medical and living standards, the increase of population has also led to the intensification of population aging, which means that in the future, perhaps in 2050, the labor force will decline significantly, the social burden will increase, and the potential economic growth rate will gradually decline.

In many parts of the world, governments emphasize national cybersecurity (internet security). Related internet security systems have been widely studied in many branches of artificial intelligence (AI), from computer vision to robotics. Among all those categories, machine learning (ML) could be regarded as the most multiuse and non-specific method. Summarized to Anthony (2022), over $28 billion was funded in machine learning applications, and over $14 billion was invested in the machine learning platform, which occupies the most in the field of AI.

Alzheimer's, the most common cost of dementia, is a neurodegenerative disease that causes issues in the brain with memory, cognition, and behavior. [10] According to Alzheimer's Disease International, it was the "top cause of disabilities in later life" in 2019. [3] In China, 3.9% of people suffer from the disease in 2020, and this figure has continued to increase for decades.[4] The prevalence and importance of AD are super obvious, and provided that it is still being understood, experts are urgently calling for more research in this field. In this essay, we will expound on the major findings so far regarding the symptoms, anatomical location, causes, diagnostic methods, and treatments.

Alzheimer's disease (AD) is a neurogenerative disease caused by both genetic and spontaneous factors. As the pathological changes progress, symptoms ranging from mild cognitive impairment to severe dementia could occur. Currently, there is no cure for AD, but several treatments have been developed to mitigate the symptoms and slow down the disease progression. Meanwhile, various testing methods have been developed to detect this disease. This essay aims to provide an overview of AD in terms of the anatomical location of pathological changes in the brain, the potential symptoms, detection methods, and available treatments. We will also present our evaluation of the detection and treatment methods.

Parkinson's disease (PD) is the second most common neurodegenerative disorder which is mainly associated with symptoms like tremor, rigidity, slowing movement and other complications including mental disabilities and cognitive problems.[1] The symptoms progress slowly. Initially, patients suffer from tremor on one side of the arms. As the disorder progresses, patients may find difficulties when talking or moving. However, no cure is currently available for Parkinson's disease. Treatments and medications are aimed to control the symptoms or slow down the progression.

Lung cancer is the second most common cancerous disease among the world population, which is caused by unregulated cell division in the lungs. (wcrf.org, 2022) In 2022, around 236740 new cases of lung cancer were diagnosed in the United States. To be more specific, damaged cells divide uncontrollably and lead to the formation of tumors. Lung cancer usually start from the bronchi and bronchioles or alveoli. (Larsen & Minna, 2011)

Lung cancer is a malignant tumor originating from the bronchial mucosa or glands of the lung. Smoking is one of the most common causes of lung cancer, and 80% - 90% of smokers will suffer from such malignant tumors [1]. It remains a major worldwide health problem, accounting for more than a sixth of cancer deaths [2]. The high morbidity and mortality rates make it one of the most dangerous tumors diagnosed. Therefore, the treatment for lung cancer is highly researched.

When developing a new drug, it is critical to possess a comprehensive understanding of the drug itself, including its composition, properties, and effects, to determine if it can be suitable for human use. This essay will go on to explore the most appropriate techniques to use when understanding a drug designed to target lung cancer, and their corresponding benefits.

Posting pictures, videos, or words which are aggressive, unfriendly, insulting or even inflammatory are generally termed as aggression on social media. We will be discussing lack of accountability, group polarization and incentive mechanism in relation to this, while elaborate on social media is not full of aggressions.

Social media, a newly developed technology that allows users to create and share comments, pictures, or videos, or to participate in the social network, has become a significant part of people's lives (Dollarhide, 2021). According to statistics from Digital 2022: China: as of 2022, out of 1.02 billion mobile phone users in mainland China, 983 million were social media users, occupying 68% of the total population (Kemp, 2022).

Addiction refers to a chronic brain disorder with biological, psychological, social and environmental factors influencing its development and maintenance (American psychological association). The criteria for addiction are various. However, withdrawal and tolerance suggested clinical addiction overall. Withdrawal is the syndrome caused by the cessation of a substance. The common syndrome includes nausea, insomnia and anxiety. Tolerance refers to the significant reducing effect of the substance after continuous substance use. Patients need to increase the dose to achieve the same desired effect (American psychological association). Social media is a virtual community where people can post their daily lives, thoughts, and comments (Dollarhide, 2021).

Globalization and digitalization has become the main theme of the current global development, people demand for improvements to make things more rapid, more convenient, more user friendly, and more equal. As fiat money was designed thousands of years ago, it's hard for this system to satisfied the current need of development. Technological developments are pushing the financial system to evolve itself and new types of currencies seem to have the possibilities of replacing the money system that haven't change for thousands of years.