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The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.

Curie · Skłodowska-Curie · Davisson · Fermi · Hahn · Jensen · Lawrence · Mayer · Meitner · Oliphant · Oppenheimer · Proca · Purcell · Rabi · Rutherford · Soddy · Strassmann · Szilárd · Teller · Thomson · Walton · Wigner The three naturally-occurring isotopes of hydrogen.

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If a relationship has issues that just don't seem to be getting resolved through constant efforts at communication, and both people feel like they are hitting a wall, then sometimes time and space is the best gift that you can give to one another.