Will a small crack in the back cover of Samsung Galaxy S4 result in unhealthy level of radiation or whatever from the phone?

Factual Questions
21

Since this the dope, I will agree plastic is a conductor of light, as long as it a acrylic, poly carbonate, or clear nylon.

22

Ouch. “Plastic is not a conductor” or “Plastic is an insulator.” Thanks!

23

Plastic is a conductor in the same sense that glass is a liquid.