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 eye of a cyclone is a region of calm, relatively clear skies and light winds at the center of the storm.

3) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

4) The #MeToo movement, originating in 2006 and gaining widespread attention in 2017, raised awareness about sexual harassment and assault, encouraging survivors to share their experiences and promoting discussions on consent and gender equality.