bridge component resonant frequency vibration stress

Small repeated vibrations can put huge stress on a bridge

Wind, earthquakes, and traffic can make parts of a bridge vibrate. If the force repeats close to the rate at which that part naturally likes to vibrate, the motion can grow much stronger and create very large stresses.

A Greek tragedy portrayed a recent defeat

Aeschylus’s play *The Persians* showed the Persian response to defeat at Salamis, just eight years earlier. Most Greek tragedies drew on mythology, making this the earliest surviving drama about recent history.

Some West Bank settlers use far more water per person

Up To 20×

In parts of the West Bank, Israeli settlers use up to 20 times as much water per person as nearby Palestinian communities. Those communities get about 20 liters per person each day, the World Health Organization’s minimum for emergency response.

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bridge component resonant frequency vibration stress

Small repeated vibrations can put huge stress on a bridge

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