February 24th, 2010 at 6:32AM

Feb 24, 1803: The Supreme Court ruled in Marbury v. Madison that any act of Congress which conflicts with the Constitution is null and void.

Feb 24, 1868: Andrew Johnson, 17th president of the United States, became the first president to have impeachment proceedings brought against him by the House of Representatives.

Feb 24, 1968: The discovery of a pulsar was announced.
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