Borides are among the hardest and most heat-resistant substances on the planet, but their Achilles' Heel, like so many materials', is that they oxidize at high temperatures. Oxidation is the chemical reaction commonly known .
Tree Frog ♥ They are called the Coqui frog in Puerto Rico because of their call. Co-KEY __ Note: This is not a coquí. This is the red-eyed tree frog (Agalychnis callidryas). –– Photo: Red eyed tree frog by Peter Krejzl