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 most-watched television event in the United States is the Super Bowl, with millions of viewers tuning in each year.

3) The name "Bluetooth" comes from the 10th-century Danish king, Harald Bluetooth, who united Denmark and Norway.

4) The Pacific Ocean is the largest ocean on Earth, covering more than 30% of the planet's surface.