Out of the mouths of babes… comes a never-ending stream of questions.

So this year, The Conversation US jumped on a great idea dreamed up by our colleagues in Australia and launched a series of articles meant to answer questions kids ask, but that everyone probably wonders about. The Conversation’s editors collect children’s questions and then look for scholars who can provide clear answers based on their own research and expertise.

Below are a few of our favorite “Curious Kids” articles from the past year. And whatever your age, if you have a question you’d like an expert to answer in 2020, send it to curiouskidsus@theconversation.com. Curiosity has no age limit!