> If we were to find that non-ionizing radiation causes problems at low doses (below where we perceive it as heat), it would have to be specific wavelengths, no

> If we were to find that non-ionizing radiation causes problems at low doses (below where we perceive it as heat), it would have to be specific wavelengths, not just non-ionizing radiation in general. You're right. I was specifically focusing on radiation below visible and infrared wavelengths, which is what radar uses as far as I know, and that is being studied in the literature I referenced. Much of the focus in that research is on the possibility of electromagnetic fields activating voltage-gated calcium channels. Baseline in that case would be whatever we normally get from whatever natural sources might exist on Earth.