The safety of children in schools is of utmost importance. Fire drills, wet-floor cones, lead free paint, asbestos abatement and security guards are common place in today's schools; for a good reason. As you walk up to a school, you will see a sign on the door that states: ‘All visitors must check in at the front desk. Every measure must be taken to keep unwanted guests from our schools. What about a dangerous guest who sneaks in? This guest is unwanted and dangerous. Public, private, charter and home schools are all at risk. You can’t see, hear or smell this invisible threat. What is this invader? It’s radon gas, the naturally occurring, radioactive gas that can enter a school through the foundation. Radon is a proven danger, let’s keep it out of our schools.