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RE: What is the most mass-efficient material able to kill us? - Random questions that I've to answer from time to time.
Light!
Coherently focussed light can burn through things like steel and acrylic and people.
And, depending on how you go about weighing it, light doesn't have any weight.
I considered that one:
To weight light, you need to stop it first... in that case the mass goes up to infinite thanks to Lorentz Force
F = q(E+v*B)