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

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

3) The development of voice recognition technology has led to the widespread use of virtual assistants such as Siri, Alexa, and Google Assistant.

4) The Paralympic Games, held immediately after the Olympic Games, showcase the athletic abilities of individuals with disabilities and promote inclusivity in sports.