You can sign up to be a scientist that chats via video meeting with classrooms across the world. Consider signing up here: https://www.skypeascientist.com/get-involved.html.
Skype a Scientist has a database of thousands of scientists and helps them connect with classrooms, families, libraries, scout troops, and more all over the globe! They give students the opportunity to get to know a real scientist and get the answers to their questions straight from the source.