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Berkeley Lab Physicist Challenges Speed of Gravity Claim Berkeley - Jun 22, 2003 Albert Einstein may have been right that gravity travels at the same speed as light but, contrary to a claim made earlier this year, the theory has not yet been proven. A scientist at Lawrence Berkeley National Laboratory (Berkeley Lab) says the announcement by two scientists, widely reported this past January, about the speed of gravity was wrong. Stuart Samuel, a participating scientist with the Theory Group of Berkeley Lab's Physics Division, in a paper published in Physical Review Letters, has demonstrated that an "ill-advised" assumption made...

Mark Twain, who knew it well, once called the Mississippi River "the body of the nation," and indeed its muddy water has been the lifeblood of commerce and communication for much of the past two centuries. 2003 will mark the 200th anniversary of Thomas Jefferson's arranging to acquire the river from France as part of the Louisiana Purchase.As part of that observance, the National Geographic Society sent historians Stephen E. Ambrose (who died in October) and Douglas G. Brinkley, and photographer Sam Abell, to travel the length of the river and report back. The result is a spectacular new book,...