Tens of thousands of people assembled on the National Mall to commemorate the 50th anniversary of Martin Luther King Jr.'s 1963 March on Washington, best known as the venue for the iconic "I Have a Dream" speech that helped galvanize the civil rights movement.
Organizers, including the Rev. Al Sharpton and King's son, Martin Luther King III, had hoped to attract 100,000 people to attend Saturday's events leading up the official Aug. 28 anniversary.
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"If you could imagine a grandfather clock and see the pendulum swinging back and forth, ideally that pendulum would swing back and forth very uniformly," Ludlow says. "Each swing would take exactly the same amount of time."
That's stability. But what if something perturbs the system, like a mischievous toddler?