The Meaning of Freedom. Columbia historian Eric Foner traces the shifting definition of American liberty in USCâs sixth annual Law and Humanities Distinguished Lecture. November 1, 2007. When it comes to freedom in America, thereâs no single lasting definition, according to world-renowned historian Eric Foner.
The first symptoms of myasthenia gravis may be: 1  Weakness of the eye muscles. 2  Difficulty in swallowing. 3  Slurred speech.
In people with myasthenia gravis, the body produces antibodies that block the muscle cells from receiving messages (neurotransmitters) from the nerve cells. The exact cause of myasthenia gravis is unknown. In some cases, it is linked to tumors of the thymus (an organ of the immune system).