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www.reference.com/article/hardest-material-earth-47d3cef59b8c369d

As for 2014, the hardest material on earth is a diamond, a form of pure carbon. It ranks 10 on the Mohs hardness scale and has a rating of between 70 and 150 GPa, or gigapascals on the Vickers hardness scale.

www.reference.com/article/man-made-materials-6502065d2f817c48

A man-made material is one that is manufactured through human effort. These materials are usually made using natural, raw materials. Examples of man-made materials are glass, rayon and nylon.

www.reference.com/article/hardest-substance-known-man-5fe176a3169c9e72

The hardest known substance is lonsdaleite, also called hexagonal diamond, according to a study published in Physical Review Letters and reported on Phys.org. Lonsdaleite is 58 percent stronger than diamond, which was previously considered to be the hardest substance.

www.reference.com/article/hardest-metal-9060987517dc7966

Maraging steel, which is a super-strong steel, is the hardest-known metal in the world. It is an iron alloy that contains high amounts of cobalt, nickel and molybdenum.

www.reference.com/article/hardest-wood-world-430b86dcefdb80e2

The hardest wood in the world is Australian Buloke, registering 5,060 pounds of force on the Janka hardness scale. Certain strands of the wood species are listed as endangered by the Australian government. It is often used for making knife handles, flooring and furnitur...

www.reference.com/article/hardest-mineral-world-398620b368c4bb96

The hardest natural mineral in the world is lonsdaleite, a rare mineral made of carbon atoms. This mineral can withstand up to 58 percent more stress than diamond, according to a report by Jessica Griggs of NewScientist.

www.reference.com/article/hardest-math-problem-433a8861602d3f81

The Millennium Prize Problems are a collection of the most difficult problems in mathematics, including the Riemann Hypothesis and the P versus NP Problem. Of the seven problems, only the Poincaré Conjecture has been solved. The mathematical problem that took the longes...