Martial arts can be useful on the street in certain situations, as it can help individuals defend themselves and escape from dangerous situations. However, the effectiveness of martial arts in real-life self-defense scenarios depends on various factors such as the individual's skill level, the specific martial art being practiced, and the circumstances of the situation. It is important for individuals to also consider other self-defense strategies and techniques in addition to martial arts training to stay safe on the street. **

An anesthetic cream can be useful in martial arts for numbing pain from minor injuries or sore muscles during training or competition. It can help athletes continue to perform at their best without being distracted by discomfort. However, it is important to use anesthetic creams responsibly and not rely on them as a long-term solution for pain management, as they may mask more serious injuries that require proper medical attention. **

Numbing cream can be useful in martial arts for numbing pain from minor injuries or sore muscles during training or competition. It can help athletes push through discomfort and continue their practice without being distracted by pain. However, it is important to use numbing cream responsibly and not rely on it as a long-term solution for pain management, as it may mask serious injuries that require proper medical attention. It is always best to consult with a healthcare professional before using any numbing cream in a martial arts context. **

Homework portals can be useful because they provide a centralized platform for students to access assignments, resources, and important information from their teachers. This can help students stay organized and on track with their work. However, they can also be not useful if they are not user-friendly or if teachers do not update them regularly, leading to confusion and frustration for students. Overall, homework portals can be a valuable tool for enhancing communication and efficiency in the learning process when used effectively. **

Mosquitoes play a role in the ecosystem as a food source for other animals such as birds, bats, and fish. However, their primary role as disease vectors outweighs their usefulness. Mosquitoes are responsible for transmitting diseases such as malaria, dengue fever, Zika virus, and West Nile virus, causing significant harm to human populations worldwide. Efforts to control mosquito populations are important for public health and reducing the spread of these diseases. **

Latin can be useful for several reasons. It is the root of many modern languages, so studying Latin can help improve vocabulary and understanding of grammar. Additionally, Latin is commonly used in scientific, legal, and medical fields, so knowledge of Latin can be beneficial for those pursuing careers in these areas. Finally, studying Latin can also provide insight into ancient Roman culture and history. **

Yes, cars are incredibly useful as they provide a convenient and efficient mode of transportation for individuals to travel from one place to another. They offer flexibility and freedom to explore different destinations at one's own pace. Additionally, cars are essential for commuting to work, running errands, and transporting goods, making them an integral part of modern society. **

Aikido can be useful for self-defense in certain situations, as it focuses on redirecting an attacker's energy rather than meeting force with force. It also promotes physical fitness, flexibility, and mental discipline. However, its effectiveness may vary depending on the practitioner's skill level and the specific circumstances of an altercation. Ultimately, whether Aikido is useful or not depends on the individual's goals and how well they are able to apply the techniques in real-life situations. **