Till's lynching death in Mississippi helped spark the Civil Rights Movement, which radically altered the course of this nation.

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Each of these curators altered the course set by his predecessor.

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Political history is strewn with debate triumphs or gaffes said to have altered the course of several presidential races, though unscrambling the effects is always hard.

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Having altered the course of history, Marty returns to 1985.

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In recent years, the best example is Apple (AAPL) which has been a PowerPlay a it single handily altered the course of the music, book, TV, movie rental, smartphone and computing industries.

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According to the ASU website, Professor Prescott has altered the course of macroeconomic thinking over the past three decades with his research that spans such areas as business cycles, economic development and general equilibrium theory and finance.

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And another further down the order, was Els, a Wentworth resident, who had altered 17 of the West Course's 18 holes.

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These trends, of course, may be altered by any number of developments, including the possible threats to cities from wars, environmental challenges or other large-scale disruptions.

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In all, 17 of the 18 holes have been significantly altered, with the 18th undergoing the most radical revamp, and the course now plays as a reduced par 71.

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