Who is a Jew? familiar with and willing to vouch for the Jewishness of their maternal lineage or the validity of their conversion. There have been several attempts to convene representatives of the three major movements to formulate a practical solution to this issue. To date, these have failed, though all parties concede the importance of the issue is greater than any sense of rivalry among them. Ethnic Jew is a term generally used to describe a person of Jewish parentage and background who does not necessarily actively practice Judaism, but still identifies with Judaism or other Jews culturally or fraternally, or both. The
Chemistry: A Volatile History such an event, Meitner was unable to make the equations balance. She calculated that the products of the fission reaction were lighter than the initial uranium, by about one fifth of a proton. Somehow, a small amount of mass had disappeared. Then slowly, the solution to this discrepancy occurred to Meitner – Einstein and "E = mc" – the missing mass had been converted to energy. Meitner's work was published in 1939, but as well generating interest amongst the scientific community, Meitner's revelations were also coming to the attention of governments on the verge of war. Fuelled by fears Nazi