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. **

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. **

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. **

The extension theorem in measure theory states that if we have a measure space (X, M, μ) and a σ-algebra N containing M, then there exists a measure ν on (X, N) that extends μ. The proof of this theorem typically involves constructing the extension measure ν by defining it on a suitable collection of sets in N and showing that it satisfies the properties of a measure, such as countable additivity and non-negativity. This often involves using the Carathéodory extension theorem, which provides a method for extending a pre-measure to a measure on a larger σ-algebra. Overall, the proof involves careful construction and verification of the properties of the extended measure ν. **

The phrase "the stone which the builders rejected has become the cornerstone" is a biblical reference from Psalm 118:22 and is also mentioned in the New Testament. It signifies the idea that something or someone initially overlooked, rejected, or underestimated can ultimately become the most important or foundational element. In a broader sense, it can symbolize the unexpected rise to prominence or significance of something that was initially disregarded or undervalued. This phrase is often used to convey the message of resilience, redemption, and the idea that greatness can come from unexpected places. **