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?

Is light matter?

the weight of light · Martin Hesselmeier

1. Higgs: What causes the weight of the world

Articles by Kate Kershner's Profile, Freelance Journalist

If a light has weight, does it have mass, and what is the same thing about darkness? - Quora

States of Matter - Definition of Solid, Liquid, Gas & Plasma with Videos of States of Matter

What Is Light? Is It Energy Or Matter?

Does light weigh anything? - BBC Science Focus Magazine

What Is Light? Is It Energy Or Matter?

If energy and matter are one and the same thing, how does light not have mass, when it does have energy? - Quora