In 1620 an English mathematician and astronomer named Edmund Gunter described a surveyor's chain with 100 links, measuring 66 feet (22 yards or 4 poles) overall. By this design, one square chain ...

Collections Chromolithograph Entitled "Custer's Last Fight" Custer’s Last Fight is considered one of if not the most reproduced lithographs of the late 19th and most of the 20th Centuries with over a ...

People with disabilities and ideas related to disability are everywhere in American history. Just as ethnicity and race are not Either/Or rigid classifications, neither is disability. A person is not ...

Benjamin Franklin's remarkable scientific accomplishments were, in part, enabled by slavery, pervasive in the British colonies both North and South. He chose to take advantage of that system. His ...