be used as a kind of clock. By calculating backerial ly it its age. ested a piece of pitc to be 700million years old—very muc people o grant th.

    In traveled to London to give a lecture at titution—t organization founded by Count von Rumford only 105 years before,t poant eon compared ness of te Victorians. Ruto talk about egration tivity, as part of  chblende.

    tactfully—for t, if not aledt Kelvin ed t t ions out. Rut oto radioactivity tly y-four million yearsKelvin’s calculations allowed.

    Kelvin beamed at Rutful presentation, but  unmoved. ed to  astute and important contribution to science—far greater thermodynamics.

    As

    scientific  revolutions,  Rut universallyaccepted. Jorenuously insisted o t ty-nine million years old, and opped only to  Rutoo mucime. But even ric dating, as decay measurements became kno ual age. Science  track, but still .

    Kelvin died in 1907. t year also sari Mendeleyev. Like Kelvin, ive enceof radiation or tron or anyt .  mostly storming out of labs and lecture  101 es Paul Stratis an unstable element.”

    Radiation, of course,  on and on, literally and in ed. In to experience clear signs of radiation sickness—notably dull acless .

    Marie Curie spent t of inction in to foundted Radium Institute of ty of Paris in 1914. Despite o t because after ted an affair  t ly indiscreet toscandalize even t least tter.

    For a long time it  anytic as radioactivitymust be beneficial. For years, manufacturers of