1) Banks provide various financial products, including savings accounts, checking accounts, credit cards, mortgages, and investment services.

2) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.

3) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.

4) 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.