https://www.youtube.com/watch?v=wCrtk-pyP0I
Imagine the size of your lung pockets. Now imagine that your lungs fill with fluid (gross, but common). Now imagine your lungs fill with fluid, next to a Microwave Signal Tower?

Watch the entire video, the waves do not have to match the size, they only need to match a size that resonates in the primarily fluid sphere.
Unironically, it really might be 5G, in a way we didn't expect.