Well that puts this argument about Si 29 and Si30 to bed for all time?
"As phonons, the waves of atomic vibration that carry heat, wind their way through silicon’s crystalline structure, their direction changes when they bump into silicon-29 or silicon-30, whose different atomic masses “confuse” the phonons, slowing them down.
“The phonons eventually get the idea and find their way to the cold end to cool the silicon material,” but this indirect path allows waste heat to build up, which in turn slows your computer down, too, Ager said."
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