1) The universe is estimated to be around 13.8 billion years old.

2) The concept of political parties allows for organized groups to mobilize support, articulate policy positions, and compete for political power through elections and political campaigns.

3) The concept of political stability refers to the ability of a government or political system to maintain continuity, order, and effective governance over a prolonged period, promoting social cohesion and economic development.

4) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.