Barbed wire, still an essential tool in the livestock industry, is today a popular collector's item.
At three points in US history, six presidents (current or former) were alive at the same time. These points were: From March, 1861-January, 1862: Presidents Van Buren, Tyler, Fillmore, Pierce, Buchanan, and Lincoln were alive. January 1993-April 1994: Presidents Nixon, Ford, Carter, Reagan, Bush (the first) and Clinton were all around. January, 2001-June, 2004: Still living were Presidents Ford, Carter, Reagan, Bush (the first), Clinton, and Bush (the second). When either Trump or Clinton take office in January, 2017, he or she will join Carter, Bush I, Clinton, Bush II, and Obama as living presidents, making it a fourth time in history six presidents were alive.
There have been eighteen attempts to kill sitting and former United States Presidents and Presidents-Elect. Four attempts on sitting Presidents have succeeded; the 16th, 20th, 25th and 35th US Presidents were all assassinated in office, and two others were injured. Successful assassinations: 1 -- Abraham Lincoln.