Could wifi-enabled devices be harmful to our health? You cannot see it or hear it but Wi-Fi blankets our homes, our schools and our cities. Australia’s safety agency says there’s no evidence of harm, but that’s not the same as saying its safe. A growing number of scientists are concerned that the widespread use of Wi-Fi and Wi-Fi-enabled devices could be slowly making us sick. In this Catalyst investigation, Dr. Maryanne Demasi explores whether our wireless devices could be putting our health at risk.