Wi-Fi, or wireless fidelity, is a type of wireless local area network (WLAN). Two or more computers form the network using radio frequency (RF) signals. The safety of these networks, however, has come under scrutiny in recent years. Some parents have become so concerned about the health risks associated with Wi-Fi networks that they have pressured school districts to remove them. In many instances, the concern is that children’s bodies are developing quickly and may be much more sensitive to these energy sources. With all this in mind, should middle school science teachers be concerned about using Wi-Fi in the science lab? This month’s column addresses this issue.