There are a few electrolyte abnormalities: hypokalemia, hypercalcemia, hyperkalemia and hypocalcemia. Hypokalemia is also referred to as low potassium. The main cause is loss of potassium in urine due to diuretic medicines. Diarrhea and vomiting can also contribute to hypokalemia.
The name of the first camera is camera obscura and is described to be the foundation on which most modern cameras are based on. Johann Zahn made the first camera, in 1685.
1050 AD-Shen Kuo experimented with camera obscura, and was the first to apply geometrical and quantitative attributes to it in his book of 1088 AD, the Dream Pool Essays. Shen never claims in his book that he was the first to experiment with a pinhole camera.