Razor blades aren't hard. They're pretty soft. That is, they'll bend before they shatter. A thin piece of metal can only cut through so many chunks of keratin before its edge is rounded out, potholed, uneven, and oxidized to the point of being useless.
>>7806367 You can do the same thing with razor blades to make them last a lot longer. I run the razor opposite of razing direction against my arm once or twice before shaving. A disposable razor can last you months.
>>7806802 Since diamond is the hardest metal they actually can't be cut, they're just polished a lot until they look real shiny, that's why diamonds are so expensive, they're actually really common (the earth's core is 67.489% diamond) but it's rare to find ones pretty enough to put on a ring.
A macroscopic object composed of a single material isn't truly a whole object - there are cracks throughout it, and there may even be more than one giant crack that divides the object into two or more objects on a microscopic scale.
A diamond, for example, stays together because where the cracks meet, they fit together perfectly. On very small scales, simply the force of atoms grabbing each other and holding on is enough to keep the diamond together.
However, the fact that the diamond isn't a single objects, but two objects that can grind together by being pushed and pulled apart, means that the perfect fit soon becomes a crappy fit and the gap between the two objects is filled with tiny shards that move about and wreak the borders between the two objects further.
Metals are defined by the fact that the atoms, due to lacking free electrons in their outer shells, don't form molecules (Also called compounds.) Instead, they bind with one another via electromagnetic attraction - there is no whole object to break.
You may have noted before in your life that if you smash a metal object hard enough, it often doesn't shatter, but instead deforms. This is caused by a trait called ductility, and metals have a lot of it while often still requiring lots of energy to deform because of the strength of the EM attraction.
Razor blades dull because they're made from cut steel, rather than being melted and cooled in a mold. The cut edges are flaky, and they smooth out as steel is wont to do. Higher quality steel will hold an edge better - I've had an electric razor for over ten years.
>>7806802 "Due to extensive research done by the University of Pittsburgh, diamond has been confirmed as the hardest metal known to man. The research is as follows. Pocket-protected scientists built a wall of iron and crashed a diamond car into it at 400 miles per hour, and the car was unharmed. They then built a wall out of diamond and crashed a car made of iron moving at 400 miles an hour into the wall, and the wall came out fine. They then crashed a diamond car made of 400 miles per hour into a wall, and there were no survivors. They crashed 400 miles per hour into a diamond traveling at iron car. Western New York was powerless for hours. They rammed a wall of metal into a 400 mile per hour made of diamond, and the resulting explosion shifted the earth's orbit 400 million miles away from the sun, saving the earth from a meteor the size of a small Washington suburb that was hurtling towards mid-western Prussia at 400 billion miles per hour. They shot a diamond made of iron at a car moving at 400 walls per hour, and as a result caused two wayward airplanes to lose track of their bearings, and make a fatal crash with two buildings in downtown New York. They spun 400 miles at diamond into iron per wall. The results were inconclusive. Finally, they placed 400 diamonds per hour in front of a car made of wall traveling at miles per iron, and the result proved without a doubt that diamonds were the hardest metal of all time, if not just the hardest metal known to man."
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