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It would seem to be the latter, given the reference to heavy metals (they probably mean noble metals more likely)
by selimthegrim 4y ago
It would seem to be the latter, given the reference to heavy metals (they probably mean noble metals more likely)
- ncmncm 4y agoNo. They are contrasting the elements operated on, mostly light elements, with heavier ones used in catalysts that are also toxic, for reasons.