Stone in example sentence

Most probably, one of humanity's greatest achievements is the invention of the alphabet, and that has been attributed to Mesopotamia with their invention of cuneiform in 1600 BC, followed by hieroglyphics in Egypt, and that story has been cast in stone as historical fact.

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Now for an intelligent being like our fly, this policy is not written in stone but rather changes as the animal learns from experience.

The oldest stone tools are choppers from the Olduvai Gorge in East Africa.

These crude tools were around for thousands of centuries, until around 1.4 million years ago when Homo erectus started shaping single, thin stone blades, sometimes rounded ovals, but often in what are to our eyes an arresting, symmetrical pointed leaf or teardrop form.

So the next time you pass a jewelry shop window displaying a beautifully cut teardrop-shaped stone, don't be so sure it's just your culture telling you that that sparkling jewel is beautiful.

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