As a rule of thumb, you can control one variable in your business: you.

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The variable freedom and control is by far the most significant predictor of life satisfaction .

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The control surfaces, acting independently or together with a variable angle of attack of up to 20 degrees (front) and 40 degrees (rear), move the car's center of aerodynamic balance around to compensate for the forces of pitch, roll, yaw and high-speed lift.

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In any event, it is the only variable over which he or she has some control.

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This configuration also will offer an innovative, variable all-wheel drive system with independent control of the drive forces on both axles.

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The prosecution said she had borderline personality disorder and her mental state was variable, while the defence said she had no control of her mind.

BBC: Nicola Edgington