- If string theory is correct does that mean that a photons and electrons have rest mass?

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Mathematics
HELP TwT The sum of infinity of a geometric sequence is 4/5 of the first term. What is the common ratio? What do UFOs use for propulsion? Is it an anti-gravity device? Is baking conduction, convection or radiation? How do I rationalise the question below? Is any form of life really simple?