Many assembled PCBs are static sensitive, and therefore must be placed in antistatic bags during transport. When handling these boards, the user must be grounded (earthed). Improper handling techniques might transmit an accumulated static charge through the board, damaging or destroying components. Even bare boards are sometimes static sensitive. Traces have become so fine that it's quite possible to blow an etch off the board (or change its characteristics) with a static charge. This is especially true on non-traditional PCBs such as MCMs and microwave PCBs.
What special protection are most PCBs shipped in? What force can easily change or even completely destroy an etch on a PCB? What's another term for "grounded" in the context of PCBs? Non-traditional PCBs include microwave PCBs and what other type of board? What class of PCBs are even more susceptible to static than standard ones?