1) The concept of self-driving cars, or autonomous vehicles, is being actively developed by companies such as Tesla, Google (Waymo), and Uber.

2) The global economy has experienced fluctuations and challenges, including the impact of the COVID-19 pandemic on businesses, supply chains, and employment, as well as efforts to address income inequality and promote sustainable economic growth.

3) The Alps, located in Europe, are a popular destination for skiing, mountaineering, and hiking.

4) The world's oldest known recipe is for beer and is over 4,000 years old.