1) Insurance fraud occurs when individuals or organizations deliberately deceive insurance companies to receive undeserved benefits.

2) 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.

3) The first commercially successful video game was "Pong," released in 1972 by Atari.

4) The world's largest diamond, the Cullinan, was discovered in South Africa in 1905 and weighed over 3,000 carats.