1) The Great Wall of China is not visible from space without aid, contrary to popular belief.

2) The legislative branch in many democracies is responsible for making laws, representing the interests of the people, and providing checks and balances on the executive branch.

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

4) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.