1) The word "country" contains three vowels: O, U, and Y.

2) The concept of self-driving cars, or autonomous vehicles, is being actively developed by companies such as Tesla, Google (Waymo), and Uber.

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

4) The largest known dinosaur, Argentinosaurus, weighed around 70-100 tons and measured up to 100 feet in length.