1) The political system of the People's Republic of China is based on the Communist Party's leadership, with the General Secretary holding significant authority and influence over the country's policies and governance.

2) The first modern health insurance policy was introduced in Germany in the late 19th century.

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

4) The World Wide Web, developed by Tim Berners-Lee in 1989, revolutionized the way information is accessed and shared on the internet.