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Opinion: Harder than diamond: have scientists really found something tougher than nature's invincible material? | University of Cambridge
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If steel is stronger the stone, then why can you sharpen a knife by grinding it against a stone? Wouldn't the knife scratch the stone away instead? - Quora
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Olympia Snowe Quote: “The American spirit is stronger than stone and mortar, tougher than steel and glass, and more enduring than any pain or ...”
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