Parkinsonâs Disease (PD) is a chronic, progressive disorder that affects nerve cells deep in the brain responsible for planning and controlling body movement. Dopamine is a chemical used in body movement.
Chart.js is a JavaScript library that allows you to draw different types of charts by using the HTML5 canvas element. Since it uses canvas, you have to include a polyfill to support older browsers. The one suggested by the author is ExplorerCanvas, so you may want to stick with it.
In mathematics, j is one of the three imaginary units of quaternions. In the Metric system, J is the symbol for the joule, the SI derived unit for energy. In physics, electrical engineering and related fields, j is the symbol for the imaginary unit (the square root of -1) (in other fields the letter i is used, but this would be ambiguous as it is also the symbol for current). A J can be a slang term for a spliff (marijuana cigarette)