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Sophie Zabar, clairvoyant, cried out in pain at precisely the instant that her twin brother, 500 km away, hit his thumb with a hammer.

Sophie Zabar, clairvoyant, cried out in pain at precisely the instant that her twin brother,
500 km away, hit his thumb with a hammer. A skeptical scientist observed both events
(brother’s accident, Sophie’s cry) from an airplaine traveling at 12c/13 to the right (see
Fig. 12.19). Which event occurred first according to the scientist? How much earlier was it,
in seconds?

This question was asked on Mar 16, 2010.

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