Hirtz's compass for locating bullets, Paris, France, 1915
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Glossary: bullet locator
A wave of electromagnetic radiation that has high energy and short wavelength. It is able to pass through many materials, except those of high density such as metals or bones. Discovered in 1895 by William Roentgen.
Exercise helpful to those with physical illness, for example stroke, or back injuries. A physical therapist is a specialist trained in using exercise and physical activities to condition and improve muscles.