What's more, a machine-made surface produces the wrong kind of friction: to do its job precisely, the plate's surface needs minute scorings, of only a few microns each, where machine oil can reside.

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This involves putting minute quantities of common foods below the surface of the skin, usually on the arm or the back.

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Alternate the charges fast enough and the minute fluttering of the film causes tiny dimples on its surface to push the air at ultrasound frequencies.

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But his hopes appear to have faded after he was the slowest man out on the soaking Interlagos surface once the second session restarted following a 70-minute delay due to horrendous weather.

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