• Hahn and Fritz Strassman first experimented with splitting an uranium atom
  
• Meitner was brought in to assist in explaining the appearance of barium and krypton during the splitting.
  
• Meitner and Frisch, in 1934, worked together to explain how the nucleus of the atom could be split into smaller elements with the release of neutrons and energy.
• This is when Meitner realized that Albert Einstein's equation, E=mc2, applied directly to the research her and her colleagues were working on. 
  
• The energy that was released was the conversion of mass into energy
• Hahn and Strassmann went on to write a manuscript in 1938 explaining their findings.
• Meitner did not know that what she had discovered would soon be used to make nuclear weapons and she said she had no part in the use of atomic bombs.
• She was never mentioned in this manuscript therefore she never received any credit for assisting in the overall experiment

Picture Sources:

• http://www.dw.de/lise-meitner-mother-of-the-atomic-bomb/a-17318196
• http://en.wikipedia.org/wiki/Lise_Meitner#Later_years