Is - two billion dollars is a unit, one unit so it is singular and you use the singular verb
think - scientists is a plural, therefore, you must use the plural verb form of think
Well, think about if you were to watch something that is inspirational to you. Why did you find it interesting? Did it make you want to change? Did it teach you something? Did you learn a lesson? People take interest in these things because people thrive off inspiration. Inspiration motivates people, and changes people. Inspirations movies, videos, and stories all serve a purpose and it is far greater than just receiving the paycheque. The purpose is to inspire people in any way shape or form they possibly can.
