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RE: How much do shadows weigh?
@nedspeaks Shadows don't have weight. Light does, shadow is simply the absence of light, hence it implies the absence of light's weight. You can think of it this way. Objects when perfectly dark have a certain weight.Light falling on them increases this value. When we weigh ourselves on a scale, ideally this should give different results in different lighting. But this value is extremely small and so it barely makes a difference. :-)
Being a physics major from Cambridge, UK, I did understand it the first time around. I was trying to make point that if you could measure the radiation weight the the effect of it on the object it falls on, then a time a shadow is cast it will make a difference in the weight. I know that it smaller than small but the philosophical point was that because a shadow cannot be cast with blocking photons and radiation, it must indirectly effect weight
@nedspeaks Totally overlooked the "negative" part. That's a nice way of interpreting it. Shadows are really strange that way. It's merely an absence of something, yet it acts as something concrete, affecting so many variables. Another important property of shadow, is that it is able to travel faster than light(not in the real sense, of course, just an interesting interpretation). I'll probably write about this in my next article.
P.S. My re-iteration wasn't meant as an insult to your knowledge as a Cambridge alumnus. If it did, I sincerely apologize.