1) The concept of reinsurance, which is insurance for insurance companies, originated in the 17th century.

2) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.

3) J.K. Rowling's "Harry Potter" series of books has sold over 500 million copies worldwide and has been translated into 80 languages.

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