The “X” in X-ray stands for the unknown , just as x stands for an unknown quantity in mathematics. During World War I, X-rays were already being used for medical purposes, including locating bullets in the human body.
The “X” in X-ray stands for the unknown , just as x stands for an unknown quantity in mathematics. During World War I, X-rays were already being used for medical purposes, including locating bullets in the human body.