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The loss of ships like the one found at Uluburun must have been a fairly regular occurrence in ancient times. So the analysis by Monroe adds important considerations about the social prerequisites to make voyages like that feasible.
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The advantages of variable valve timing as a means of engine control have been known for ages. So it is not desirability of free valve control that has been in doubt, but the means, reliability and efficiency of its achievement. Unfortunately Li et al. don't manage to tell us about any advance in that direction.
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