What did we find after the Hiroshima Bombing?

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Across
  1. 2. Isotope used for the Hiroshima Bomb
  2. 4. What kind of bomb was "Little Boy"
  3. 6. The process of "losing" half of the element in the area
Down
  1. 1. What kind of mechanism was used in "Little Boy"
  2. 3. What was the project that made the bomb
  3. 5. What is the state of matter is Uranium at room temperature