I'm sorry, but I cannot answer that question as I do not have enough information about the specific situation or person you are referring to. If you can provide more context or details, I would be happy to try to help. **

You may not be able to select the performance mode for a few reasons. One possibility is that your device may not support performance mode, or it may not have the necessary hardware or software capabilities to enable it. Another reason could be that the performance mode may be disabled or restricted by the device's manufacturer or by the system settings. Additionally, some devices may require certain conditions to be met, such as being plugged in or having sufficient battery life, in order to activate performance mode. **

The cornerstone of the German economy is often considered to be the manufacturing and engineering company, Siemens. Siemens is a global powerhouse in the fields of electrification, automation, and digitalization, and it has a significant impact on the German economy through its extensive operations and workforce. The company's innovative technologies and products have contributed to Germany's reputation as a leader in industrial and technological advancements. **

The proof of performance for BAföG, which is a German federal financial aid program for students, is typically demonstrated through regular enrollment in a recognized educational institution and satisfactory academic progress. Students must provide evidence of their enrollment and attendance, as well as their academic achievements, in order to continue receiving BAföG funding. This can include submitting transcripts, certificates of enrollment, and other relevant documentation to the BAföG office. Additionally, students may need to report any changes in their academic status or personal circumstances that could affect their eligibility for BAföG. **

I'm an AI and do not have the ability to make purchases or browse the internet in real-time. My responses are based on general knowledge and information available up to September 2021. eBay is a platform where prices can vary greatly depending on demand and availability, so it's possible to find good deals on PlayStation 5 consoles if you're patient and keep an eye out for listings. It's always recommended to research prices and sellers thoroughly before making a purchase to ensure you're getting a good deal. **

The box used in a cornerstone laying ceremony is typically called a time capsule. This box is filled with items that represent the current time and are meant to be opened by future generations. It is then placed within the cornerstone of a building as a way to commemorate the construction and mark the beginning of a new chapter. **

Chemistry is a cornerstone of the natural sciences because it provides a fundamental understanding of the composition, structure, and properties of matter. It is essential for understanding the behavior of atoms and molecules, and how they interact to form the substances that make up the world around us. Chemistry also plays a crucial role in other natural sciences such as biology, physics, and environmental science, as it provides the foundation for understanding chemical reactions, energy transfer, and the behavior of materials. Overall, chemistry is significant as it provides the basis for understanding the natural world at the molecular level. **

Escape-proof prisons are designed to prevent inmates from breaking out, but that doesn't necessarily mean they are burglary-proof. While the security measures in place may be effective at keeping prisoners in, they may not be as effective at keeping burglars out. Burglary-proofing a facility requires different security measures, such as alarms, surveillance cameras, and secure entry points, which may not be the primary focus of an escape-proof prison. Therefore, just because a prison is escape-proof doesn't guarantee that it is also burglary-proof. **