The Atomic Age began on this day in 1942 in a tent on a squash court at the University of Chicago. At 3:25 p.m., Enrico Fermi and scientists engineered the first controlled nuclear fission chain reaction. Source: Library of Congress

On Dec. 1, 1955, Rosa Parks was arrested in Montgomery, Ala., for disobeying state law by refusing to surrender her seat on the bus to white passengers. Source: Library of Congress

Samuel Langhorne Clemens (Mark Twain) was born on Nov. 30, 1835, in Florida, Mo. Source: Library of Congress

President Truman’s "The Buck Stops Here" sign, which sat on his desk, was made in the federal reformatory in El Reno, Okla., and mailed to Truman on Oct. 2, 1945. Source: Harry S. Truman Library & Museum

In its pure form, tryptophan can induce sleep, but turkey’s tryptophan doesn’t cause drowsiness. Other foods, including beef and soybeans, have higher concentrations of the substance. Source: National Geographic

The Truman Library cannot confirm the rumor that President Truman pardoned a Thanksgiving turkey in 1947, starting the White House tradition. According to the library, its staff has found "no documents, speeches, newspaper clippings, photographs, or other contemporary records" to back up the story. Source: Harry S. Truman Library & …
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In the first half of 2009, 99.3 percent of U.S. imports of live turkeys came from Canada, at a value of $9.2 million. Source: Census Bureau

AAA estimates that 38.4 million Americans will travel 50 miles or more over the Thanksgiving weekend, the bulk of them (33.2 million) traveling by car. The total is a 1.4 percent increase over last year. Source: AAA.com

President Franklin D. Roosevelt declared that Thanksgiving 1939 would be held not on the last Thursday of the month, but the fourth Thursday. The declaration, which moved the national holiday up to Nov. 23 that year, was made at the request of business owners who wanted more shopping days between …
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President Abraham Lincoln proclaimed that Thanksgiving would be a national holiday, observed on the last Thursday of November, in 1863. Source: Census Bureau