business? >> the same preparedness that you have for a hurricane or any emergency situation, have a food supply, water supply, medicine. mark: what about the electrical attack on your house, can you have a room protected? >> you could. you could have a metal shed. mark: that's all it takes? >> you could have a -- if you have electrical equipment or medical equipment or communications equipment that you wanted to keep safe. if you had a metal garbage can with a tight fitting lid and put the equipment inside a plastic bag so it doesn't touch the inside, that would mitigate the effects. you should have an emergency generator at your house and don't put it on automatic, leave the switch on manual. so there are things. you could have solar panels which are inherently robust against emp anything to get you off the grid and makes you more self-sufficient would be a way of protecting yourself. and you can also protect your