1) Orchids are one of the largest families of flowering plants, with over 25,000 species.

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 book series "The Chronicles of Narnia" by C.S. Lewis has sold over 100 million copies worldwide.

4) Democracy is a system of government in which power is vested in the people, who exercise it through elected representatives. It allows for political participation, freedom of speech, and protection of individual rights and liberties.