It has also garnered dozens of celebrity supporters, including Leonardo DiCaprio, Bo Derek, Yao Ming, Scarlett Johansson, Megan Fox, Edward Norton and Paul Rudd.

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"I think what it showed was the manual capacity isn't there anymore, " said Edward Ditmire, an analyst at Fox-Pitt Kelton.

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Madonna has cast James Fox and his son Laurence Fox in her film about Edward VIII's wife, Wallis Simpson.

BBC: Madonna casts Fox family for Wallis Simpson film