What is the absolute hardest substance known to mankind???
965654
I would have said Diamonds but I just found this from physicsweb.org:\n\n    Diamonds are not forever\n\n    Physicists in Germany have created a material that is harder than diamond. Natalia Dubrovinskaia and colleagues at the University of Bayreuth made the new material by subjecting carbon-60 molecules to immense pressures. The new form of carbon, which is known as aggregated diamond nanorods, is expected to have many industrial applications (App. Phys. Lett. 87 083106).\n\n    The hardness of a material is measured by its isothermal bulk modulus. Aggregated diamond nanorods have a modulus of 491 gigapascals (GPa), compared with 442 GPa for conventional diamond. Dubrovinskaia and two of her co-workers - Leonid Dubrovinky and Falko Langenhorst - have patented the process used to make the new material.\n\n    Diamond derives its hardness from the fact that each carbon atom is connected to four other atoms by strong covalent bonds. The new material is different in that it is made of tiny interlocking diamond rods. Each rod is a crystal that has a diameter of between 5 and 20 nanometres and a length of about 1 micron.
1021233
this is reallie hard..
1142471
I think it's krypton. \n\nIt's colorless, odorless, tasteless, 1.14ppm in atmosphere, and the whole "cryptic" thing.
861565
1.  Diamond is the hardest known natural material and one of the two best known forms (or allotropes) of carbon, whose hardness and high dispersion of light make it useful for industrial applications and jewelry.\n\n2.  Covalent bonds.
379849
Tungsten is the strongest metal known to man at this time
675020
Try looking at a substances MSDS.  That is Material Data Safety Sheet.  If it is a pure substance that will be helpful. Just put the name of the substance and MSDS into yahoo and you'll find a sheet
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The Daily Mail in the UK says:\n\nPolonium 210 is one of the most toxic substances known to man, with a particle the size of a speck of dust enough to cause the sort of slow, agonising death suffered by Alexander Litvinenko. \n\nWeight for weight, the rare radioactive isotope is 250billion times more toxic than cyanide, and more than a billion times more radioactive than uranium
388152
What is the hardest mineral in the world? I think that is what you are asking???\n\nThat would be diamond which is composed entirely of the element carbon. It shares the same chemical makeup with graphite which tends to be one of the softer minerals (used in your pencil "lead"). However, diamonds have been exposed to extreme heat & pressure for a very long period of time. That makes the difference between diamond & graphite.\n\nSmaller, impure diamonds are crushed & used on the tips of saws to cut & drill through rocks.\n\nOn Moh's Scale of Hardness, Diamond is a 10, the hardest of all minerals. It will cut through all others.
90889
Caffeine!\nhttp://www.geocities.com/anteriorlobe/images_molecules/Caffeine_0640x480.jpg
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No, Diamond is the hardest material on earth, and carborundum is a diamond stimulant (tries to simulate the appearance of diamond).\n\nIn fact, diamond is three times harder than carborundum.\n\nCarborundum, a trademark name for Silicon carbide manufactured as an abrasive, is a ceramic compound of silicon and carbon (also known as moissanite).\n\n"Most silicon carbide is man-made for use as an abrasive (when it is often known by the trademark carborundum), or more recently as a semiconductor and moissanite gemstones. The simplest manufacturing process is to combine sand and carbon at a high temperature, between 1600 °C and 2500 °C."
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synthetic diamonds.\n\n"Diamond, it turns out, is a geek's best friend. Not only is it the hardest substance known, it also has the highest thermal conductivity - tremendous heat can pass through it without causing damage. Today's speedy microprocessors run hot - at upwards of 200 degrees Fahrenheit. In fact, they can't go much faster without failing. Diamond microchips, on the other hand, could handle much higher temperatures, allowing them to run at speeds that would liquefy ordinary silicon. But manufacturers have been loath even to consider using the precious material, because it has never been possible to produce large diamond wafers affordably. With the arrival of Gemesis, the Florida-based company, and Apollo Diamond, in Boston, that is changing. Both startups plan to use the diamond jewelry business to finance their attempt to reshape the semiconducting world."
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bacteria\n\n*edit*\nHey Oliv! Neutron is not a living thing!\n\n*edit*\nHey! You too DramaGuy! What are you talking about? It's the smallest LIVING THING he wrote
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Carbon dioxide. (it is a greenhouse gas, which can help to kill all life on earth, pretty harmful I would say.)
736173
Diamonds are the hardest natural material; but there are harder man-made materials. \n\nAggregated Diamond Nanorods (ADNR) were developed last year. ADNR can scratch natural diamonds, thus ADNR is harder than natural diamond and consequently more resistant against abrasion. \n\npolyyne, a superhard molecular rod comprised of acetylene units - that resists 40 times more longitudinal compression than a diamond. Ironically, these glittery gems are comprised from the element carbon and have the weakest type of chemical bonds, while polyyne has the strongest bonds in carbon chemistry. \n\nI wasn't able to find a comparison of polyyne and ADNR, but I believe ADNR was developed first and held the title until polyyne was developed a short time later. I'm not positive about the order though. Either one is harder than my head which is saying something.
34588
Purely an opinion on my part, but..\nHydrogen - because it is the most abundant element and is a component of water ( the universal solvent)\nOxygen, because it is also a componant of water and is key to redox reactions\nCarbon - because it exists in many different states coal graphite diamond\n\nThe next two are more difficult, but I offer up Iron, because it is the last element able to be produced by a star without going Nova\n\nand Gold - for obvious reasons\n\n\nConsidering Chemical reactions, I would change in favor of Flourine, Sodium, Oxygen, Chlorine and Hydrogen
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BEER!!!!\n\nDrink it at full throttle, til you can't read the label on the bottle.
321248
Yes.  The methane and hydrogen, the main ingredients, are flamable.  The perfect circumstances?  That's a tough one.  Perhaps if you were a bit stoned so that it would be humorous?