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by CamperBob2 135 days ago
Think of it this way, Sodium metal is abundant and cheap with 30x the energy storage (and energy transfer) of other solutions yet nobody has used it in almost any product ever (including as a coolant).

Huh? See https://www.terrapower.com/natrium/ -- and it's not exactly a new idea.

Also not uncommon to use sodium-filled exhaust valves in car, motorcycle, and aircraft engines.