Microlattice is back in the news.
“Our technology could revolutionize football, batting,
bicycle, and motorcycle helmets, making them better at protecting the wearer and much easier to have on your head due to the increased airflow,” says Eric Clough, a researcher at HRL Laboratories, a materials science doctoral student at the University of California, Santa Barbara, and the lead scientist on the study.
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https://bioengineer.org/material-for...head-injuries/
and
https://phys.org/news/2019-11-materi...-injuries.html