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Beryllium
Info:
In its processed metallic form, Beryllium is one of the lightest and stiffest naturally occurring materials known to science, unfortunately, it is also highly brittle, making unalloyed Beryllium unsuitable for most industrial processes. However, Beryllium was discovered to be extraordinarily effective at absorbing neutron radiation, and has since become a key component in the construction of modern reactors and engines.