The knee is the largest joint in the human body and is considered the most complicated one. It is formed by the lower part of the femur, the tibial plateau and the knee cap.
Weather. Calgary's weather is quite unusual compared to the weather in the rest of Canada. Where Eastern Canada and B.C. are quite humid, with ample rain and snow, Calgary is very dry most of the time, with an average annual precipitation of 41 cm (16 inches). While many Canadian homes have de-humidifiers, most Calgary homes have humidifiers.
onward is completely right about the unpredictability of Calgary weather in Sep/Oct. We have snow at least once every September, but nobody knows which of the 30 days it will be. But I wouldn't come to see the leaves change. It's rather anti-climactic here.