Anyone who has studied and practiced mathematics can understand it. Mathematics is a universal language that can be learned and comprehended by people of all ages and backgrounds. With dedication and effort, anyone can develop their mathematical skills and understanding. **

The person who understands the joke is the one who comprehends the humor or underlying meaning behind it. This individual is able to connect the dots, interpret the punchline, and find it amusing or clever. Understanding a joke often involves having the necessary background knowledge, cultural context, or linguistic skills to grasp the humor intended by the joke-teller. **

Stewie's dog, Brian, is the character who seems to understand Stewie the most. Throughout the show, Brian is often the one who can communicate with Stewie on a deeper level and engage in meaningful conversations with him. They share a unique bond and have moments of genuine connection, despite Stewie's often abrasive and manipulative behavior. Brian is able to see past Stewie's tough exterior and understand his vulnerabilities and insecurities. **

People who have a strong grasp of logical reasoning and problem-solving skills tend to understand math well. Additionally, individuals who are able to approach mathematical concepts with a systematic and organized mindset often excel in the subject. Furthermore, those who are able to think abstractly and make connections between different mathematical ideas are likely to have a good understanding of math. **

People who have knowledge of the specific cultural references or context within the joke will likely understand it. **

The quote "Hello, who understands this quote?" seems to be a playful and self-referential inquiry about the understanding of the quote itself. It could be interpreted as a lighthearted way of engaging with the audience and inviting them to reflect on the meaning or purpose of the quote. The use of "Hello" at the beginning also suggests a friendly and open approach to communication. Overall, the quote appears to be a simple and direct way of initiating a conversation or prompting introspection. **

Pope Francis is understood by a wide range of people, including Catholics, other Christians, and individuals of various faiths or no faith at all. His messages of compassion, social justice, and care for the environment resonate with many people around the world. Additionally, his efforts to address issues such as poverty, inequality, and the refugee crisis have garnered support from diverse communities. While there may be disagreements or misunderstandings about certain aspects of his teachings, Pope Francis continues to have a significant impact and is understood by a broad audience. **

This East German joke would likely be understood by people who are familiar with the history and culture of East Germany, particularly during the time of the Cold War. It may also be understood by those who have knowledge of the political and social context of that era. The joke plays on the stereotypes and perceptions of East Germans during that time period, so individuals with this background would be more likely to understand the humor. **