A prime lens with a focal length between 35mm and 50mm is typically considered suitable for street photography. These lenses offer a natural field of view that closely resembles what the human eye sees, making them great for capturing candid moments in urban environments. Additionally, prime lenses are often compact and lightweight, which is ideal for street photographers who need to move quickly and discreetly. Overall, a 35mm or 50mm prime lens is a popular choice among street photographers for its versatility and ability to capture authentic moments. **

A macro lens is typically the best choice for product photography. Macro lenses are designed to capture small subjects with great detail and clarity, making them ideal for capturing the intricate details of products. They also have a close focusing distance, allowing you to get up close to the product for detailed shots. Additionally, a lens with a focal length between 50mm and 100mm is recommended for product photography as it provides a natural perspective and minimizes distortion. **

Archimedes is known for discovering the principles of buoyancy and the concept of the lever. He also developed the Archimedes screw, a device used to raise water from a lower to a higher level. Additionally, he made significant contributions to the field of mathematics, including calculating an accurate approximation of the value of pi. **

The concept of mathematics is not something that was "discovered" in the traditional sense, but rather it is a human creation that has evolved over time. Mathematics is a system of logic and rules that humans have developed to understand and describe the world around them. While the fundamental principles of mathematics may exist in the natural world, the specific language and concepts of mathematics are human inventions. Therefore, it is more accurate to say that people developed and refined mathematics rather than "discovered" it. **

For animal photography, a camera with a fast autofocus system and high burst rate is essential to capture fast-moving subjects. A good choice would be a DSLR or mirrorless camera with at least 20 megapixels for high-quality images. As for the lens, a telephoto lens with a focal length of 70-200mm or longer is recommended to get close-up shots of animals without disturbing them. Additionally, a lens with image stabilization can help reduce camera shake when shooting handheld in low light conditions. **

For wildlife photography, a camera with a fast continuous shooting speed, high resolution, and good low-light performance is ideal. Cameras like the Canon EOS 90D, Nikon D500, or Sony Alpha a6600 are popular choices. When it comes to lenses, a telephoto lens with a focal length of at least 300mm is recommended to capture distant wildlife without disturbing them. Lenses like the Canon EF 100-400mm f/4.5-5.6L IS II, Nikon AF-S NIKKOR 200-500mm f/5.6E ED VR, or Sony FE 200-600mm f/5.6-6.3 G OSS are great options for wildlife photography. **

Robert Koch is known for his groundbreaking work in microbiology. He is credited with discovering the causative agents of several infectious diseases, including the bacteria responsible for tuberculosis, cholera, and anthrax. Koch's work laid the foundation for the field of bacteriology and revolutionized our understanding of how diseases are transmitted and spread. His discoveries have had a lasting impact on public health and medicine. **

One can discover oneself by engaging in self-reflection and introspection. This involves taking the time to think about one's values, beliefs, strengths, weaknesses, and goals. Seeking feedback from others can also provide valuable insights into one's character and behavior. Additionally, trying new experiences, stepping out of one's comfort zone, and exploring different interests can help uncover hidden talents and passions, leading to a better understanding of oneself. **