The world's oldest living animal, a 187-year-old tortoise named Jonathan, was born before the first photograph was taken. Every year, about 8 million tons of plastic waste ends up in the ocean. The Great Wall of China is not visible from space without aid. The number of mobile phones in the world now exceeds the global population. In just one century, technology has advanced from the first airplane flight to space exploration and smartphones. Each generation brings new challenges and innovations, shaping a world that is constantly evolving.