Mach is a measure of the ratio of the velocity of an object, in this case a plane, to the velocity of sound, which equals Mach 1, or 761.2 miles per hour.

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In a statement, they said the new proposals represented "a fundamental change to the governance structure which underpinned the agreed merger of equals" initially announced in February.

BBC: Glencore confirms new Xstrata bid terms

In a statement, Xstrata's independent directors said the new proposals represented "a fundamental change to the governance structure which underpinned the agreed merger of equals" initially announced in February.

BBC: Glencore tables fresh Xstrata bid

World number one Rafael Nadal is searching for his fifth consecutive title to usurp Borg's record of four in a row, which he currently equals.

CNN: Why do tennis greats struggle at the French Open?

When the debt on which interest is paid equals the GDP level of a nation, the economy must grow faster than the interest rate to avoid debt-servicing costs consuming all the benefit of economic growth.

WSJ: Phil Gramm and Steve McMillin: The Debt Problem Hasn't Vanished