An employee who is bright enough to spot a complementarity may not be content with repairing kitchen appliances, so companies will find that some of the pressure to break down occupational barriers will come from the bottom up.

ECONOMIST: Why pay is becoming less equal

Seemingly strong people sometimes break down at the slightest bit of pressure.

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This year he completed what is believed to be the first ever fracture stimulation procedure in Turkey: injecting a mixture of water and sand at high pressure down the wells to break up rock and release gas.

FORBES: Magazine Article