Why do we need water to survive?
Why do we need oxygen?
What would happen if the sun went out?
Why is salt crunchy? Why is gum chewy?
Why do people learn?
Where does electricity come from?
What’s the function of bees in the world?
Why does sun look reddish during the sunset and not yellow as it is during rest of the day?
Where does the salt go when salt water turns into water vapor?
How big is the universe?