1) The concept of sovereignty refers to the supreme authority and power of a state to govern itself, make decisions, and control its own territory without interference from external forces.

2) The Black Lives Matter movement gained renewed momentum in 2020 following the killings of George Floyd, Breonna Taylor, and others, sparking protests and discussions on systemic racism, police reform, and social justice around the world.

3) The first consumer digital video recorder (DVR), the TiVo, was introduced in 1999 and allowed users to record and store television programs for later viewing.

4) In Japanese mythology, deities known as kami are revered and play integral roles in Shinto beliefs and practices. Figures such as Amaterasu (goddess of the sun), Susanoo (god of storms), and Izanagi and Izanami (creators of the world) feature prominently, along with legendary creatures like dragons and kitsune.