Is there anything harder than diamond?

In physics, hardness is a measure of how resistant solid matter is to various kinds of permanent shape change, when a force is applied. Hardness can be measured on the Mohs scale where diamond is ranked as the hardest natural material. Diamond is made from carbon atoms joined by extremely strong covalent bonds. There are harder synthesised materials though; for instance, aggregated diamond nanorods, or ADNRs, are made by subjecting carbon-60 molecules to immense pressures.

Why do we sleepwalk?

As with most brain-related questions there is no direct evidence or cause as to the exact underlying mechanism for what makes us sleepwalk, but nevertheless there has been some interesting research into this area. You may be aware that there … Continued