In Brazil's vast Northeast, the climate hardens inhabitants the way it hardens the Earth.

NPR: Brazil Produces Award-Winning Wine

Wherever the light hits the material, it hardens into a polymer, creating a grid of cells full of liquid crystal.

ECONOMIST: REPORTS

As the fat cools it hardens and deposits gradually build up.

BBC: Fat-eating bacteria put in Hull sewers to remove blockages

And you wind up having an impression of a candidate sooner than you meant to, and it hardens into an opinion earlier than it used to.

WSJ: The Life of the Party

When the sap dries, it hardens into gold-colored nuggets.

WSJ: A Shift for the Magi? Frankincense Shortage

While DOD hardens assets it deems vital, no comparable civil program exists.

CENTERFORSECURITYPOLICY: Center For Security Policy

It toughens the spirit, hardens the soul, makes you dig deeper.

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