There could be a few reasons for an unlit helicopter flying over Lankwitz at night. It's possible that the helicopter is conducting a military or law enforcement operation that requires stealth, such as surveillance or a rescue mission. Another possibility is that the helicopter is experiencing a technical issue with its lights, causing them to malfunction. Additionally, the helicopter could be participating in a training exercise that involves flying without lights to simulate nighttime combat scenarios. **

People living in residential areas, especially those in urban areas, have likely suffered from noise due to craftsmen, renovation, construction, and remodeling work. Additionally, individuals working in office buildings or commercial spaces may have also experienced noise disruptions from nearby construction or renovation projects. Furthermore, students in schools or universities located near construction sites may have been affected by the noise as well. **

It is not accurate to label feet as "flat" or "normal" as there is a wide range of foot shapes and arch types that can be considered normal. Some people have lower arches, which may be referred to as "flat feet," while others have higher arches. Both types of feet can be considered normal and functional. It's important to focus on the overall health and function of the feet rather than categorizing them as flat or normal. **

"Foot" is the singular form, while "feet" is the plural form. For example, "I hurt my foot" refers to one foot, while "I hurt my feet" refers to more than one foot. It's important to use the correct form depending on whether you are referring to one or multiple feet. **

Mercedes designs its interiors to be appealing in order to create a luxurious and comfortable driving experience for its customers. The company understands that the interior of a car is where the driver and passengers spend most of their time, so they prioritize creating a space that is visually attractive, well-crafted, and filled with high-quality materials. This attention to detail helps to enhance the overall perception of the brand and contributes to the premium image that Mercedes is known for. Additionally, a well-designed interior can also contribute to the overall satisfaction and enjoyment of the driving experience, which can lead to increased customer loyalty and positive word-of-mouth. **

Closed windows of unlit rooms often appear dark or black from the outside because light cannot pass through the window into the room. Without any light entering the room, the interior appears dark in contrast to the brighter exterior surroundings. This lack of light reflection or transmission through the window creates the perception of darkness or blackness when viewed from the outside. **

To determine if you have normal feet or flat feet, you can perform a simple test. Wet your feet and then stand on a flat surface where your footprint can be seen. If you have a normal arch, you will see a curve along the inside of your foot connecting the ball of the foot to the heel. If your footprint shows the entire sole of your foot with little to no curve, you likely have flat feet. It is recommended to consult with a healthcare professional for a proper diagnosis and treatment if needed. **

I'm sorry, but as a language model AI, I do not have the ability to physically see or assess your feet. To determine if you have wide or narrow feet, you can try measuring your feet or visiting a shoe store for a professional fitting. Wide feet typically require shoes with a wider width size, while narrow feet require shoes with a narrower width size. **