Greg Farris writes:

RADIOACTIVITY (discovery of)
FALSE: The word "radioactivité" comes from Marie Curie, whose pioneering
work is of paramount importance, but of course it is subsequent to the
breakthrough discovery of X- Rays, by the German Roentgen in 1895.

This is a misconception. Radioactivity is nuclear decay. The
production of x-rays has nothing to do with radioactive decay.
Roentgen discovered the properties of a specific range of frequencies
of electromagnetic radiation, but this is completely unrelated to the
phenomenon of nuclear decay, which produces radioactivity (emission of
subatomic particles and certain frequencies of electromagnetic
radiation associated with the spontaneous reconfiguration or mutation
of atomic nuclei).

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