Here are 16 things you may not know about Abraham -- he had no middle name -- Lincoln, the 16th president of the United States. When Lincoln was 9, he was kicked in the head by a horse, knocking him out for hours. Lincoln's father, Thomas, earned 4 cents an hour in 1805 catching and whipping recalcitrant slaves in Kentucky. Lincoln's mother, Nancy Hanks Lincoln, died in 1818 when the family dairy cow ate poisonous roots and she drank the milk. He is the only president with a patent -- No. 6469 -- for a device used to lift boats over sandbars. John Wilkes Booth, Lincoln's assassin, can be seen in a photograph taken at Lincoln's second inaugural speech in March 1865. A month later, Booth and his co-conspirators hatched a plan to assassinate Lincoln, Vice President Andrew Johnson and Secretary of State William Seward on the same night. Seward was stabbed in the throat and face in his home but lived. Lincoln was nominated by Republicans for his first run as president in 186...