If you thought the hardest substance on earth was diamond, that was a good, if inaccurate guess. It is technically an aggregated diamond nanorod. It is actually a collection of nano-scale diamonds, and it is the least compressible, hardest substance known to man. They aren’t naturally occurring, which is actually kind of cool, since it implies we could one day coat our cars in this stuff and just walk it off when we collide with a train (not really). It was developed in Germany in 2005 and will likely be used in the same capacity as industrial diamond, except will be more wear-resistant than regular diamonds
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