I just wanted to pitch in to say that if science wasn't a determining factor in helping you decide whether or not to get the protection plate for your lap or the glasses for your eyes, then how will you actually know if these products were effective?
Misunderstanding... science IS the determining factor. I was making a general statement that no matter what the science says today, it could change on further studies. And, my degree of confidence on whether they are effective is reliant on science. I know my glasses are helping my eye strain a lot, but I have no idea if they are protecting my eyes very well. As for the dangers of a laptop on the lap, I will go with the science for now even though I have no gauge as to whether shielding is necessary, other than tingles on my lap, which I accept is from harmless EMF and heat.