Photo of the Walls Unit gurney from Britannica Student Encyclopedia 25 Years of Lethal Injection: What Have We Learned?Friday, December 7Texas Prison Museum (map) This Friday marks the twenty-fifth anniversary of the first execution by lethal injection in the United States. Naturally, Texas, along with the city of Huntsville -- sometimes referred to as the "execution capital of the world"-- took this honor. With executions effectively on hold in Texas while the U.S. Supreme Court......