1) The word "book" contains two vowels: O and O.

2) The name "Bluetooth" comes from the 10th-century Danish king, Harald Bluetooth, who united Denmark and Norway.

3) Insurance premiums are the payments made by policyholders to insurance companies in exchange for coverage.

4) The term "cloud computing" refers to the delivery of computing services, including storage, databases, and software, over the internet rather than on a local server.