Here is what Steven Pinker writes in How the Mind Works:
"The linguist Noam Chomsky once suggested that our ignorance can be divided into problems and mysteries. When we face a problem, we may not know its solution, but we have insight, increasing knowledge, an an inkling of what we are looking for. When we face a mystery, however, we can only stare in wonder and bewilderment, not knowing what an explanation would even look like."
Write down 10 problems and 10 mysteries. Remember some questions might be mysteries for some, problems for others, or even answered.