Cancer and cancer treatment can make a person more susceptible to infection and increase the risk of gum disease. Alcohol affects oral defense mechanisms. Stress impairs the body's immune response to bacterial invasion.
Magnetometry. Detailed magnetic survey known as magnetometry is an effective and efficient geophysical survey technique used to define areas of past human activity by mapping spatial variations and contrast in the magnetic properties of soil, subsoil and bedrock.
Another inferometry technique measures the accelerations of an object with a known mass. Force is then inferred from it's accelerations. This is useful if the object is small or likely going to be destroyed in the measurement. It was also how the mass to charge ratio of the electron was determined all those years ago.