What are the Northern Lights?
Why does the rainbow have only seven colours?
What is the function of flies and mice within their ecosystems?
Para que existen las moscas y los ratones? (Big Question originally submitted in Spanish).
What is the process of evolution?
How and why do landforms change over time?
Can we live on a different planet?
How does an email travel from one device to another?
Why did people used to think that the world was flat?
How has Benjamin Franklin’s kite experiment changed our lives?
Where does water come from?