Sub-questions are narrower questions. They are important because they provide the 'skeleton' around which you will find information to answer your main research question.
Both inventions were done by teenagers at their times.
Both inventions claimed to help the environment: Boyan Slat's machine would clean up trash floating in ocean. Duro-Aina Adebola, Akindele Abiola, Faleke Oluwatoyin, and Bello Eniola proposed power generation from urine that would not create carbon monoxide.
Unfortunately both inventions were also challenged by more established scientists and engineers.
Someone who is brave
someone who is persistent
someone who sets an example for others
someone who is dedicated to a cause
Dramatic irony is your answer. there are three types, situational, dramatic, adn verbal.
