Tech News 1: From ancient times to the space age, concrete has staying power

[bob_turner]

The earliest known use of concrete is a floor that dates back to Galilee, circa 7000 BCE, still sound when unearthed in 2007. After thousands of years as the go-to building material, it might seem like science surely could come up with something better, perhaps a material that doesn't crack or crumble when used in columns or sidewalks.

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