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Polyethylenes, in common with most polymers, exhibit different mechanical properties depending on their structure; for instance, polyethylene nanofibers can have ultrahigh strength. This makes simple methods to control structure during polymer preparation particularly valuable. On page 812 of this issue, Zhang Hu and colleagues use metallocene catalysts supported on titania nanotubes, coupled with controlled polymerization conditions, to create polyethylene structures such as nanofibers, nanosheets, and floccules. They elucidate the correlation between preparation conditions and resulting structure, and look at how these conditions also control chain morphology at a molecular level.