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

2) Lightning strikes the Earth about 8 million times a day.

3) The concept of proportional representation, used in some electoral systems, aims to ensure that political parties' representation in government aligns more closely with the proportion of votes they receive from the electorate.

4) The word "table" contains two vowels: A and E.