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320 pages, Hardcover
First published October 10, 2013
the atomic masses were still not quite exact multiples of that of hydrogen. They were always slightly less: there was a ‘mass defect’. [They] realized that in this tiny deficit resided the immense power of the nucleus. As protons come together and fuse to form a nucleus, a little bit of their mass is converted to energy, in accord with Einstein’s equivalence of mass and energy E=mc2. The release of this energy is what makes the nucleus stable: it is called the binding energy. As Einstein’s iconic equation implies, the energy equivalent of mass is enormous, being multiplied by the speed of light squared. (p. 167)