Is Light Matter and Does It Weigh Anything?

Is light matter or a wave? If it's matter, how can you measure what light weighs? Einstein's theory of relativity simultaneously clarifies and muddies things.
Seven ounces a ray! No, that's a lie. Measuring the weight of light is not as straightforward as that. So what's the more complicated explanation?

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Is Light Matter and Does It Weigh Anything?

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