Liquid water molecules absorb lighter in the microwave bandwidth, which excites the water molecules as their energy is increased. Most molecules are functionally transparent to microwaves, so they are unaffected.

However, there's no way of knowing for sure whether some rare (but crucial) molecules in in our nervous system or endocrine system, and inadvertantly wreck millions of developing children.

5G technology should be rigerously beta tested for a decade on the households of executives at Qualcom and other major Telecoms. Then we can discuss rolling it out to the public.