greatest hoaxes of all time

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Across
  1. 2. chess robot who defeated Benjamin Franklin and Bonaparte
  2. 4. name of astronomer who claimed that a planetary alignment would decrease gravity
  3. 6. name of P.T. Barnum's mermaid
  4. 7. Hull's ten foot tall petrified man
  5. 8. archaeological hoax, fake fragments of a hitherto, unknown form of human
Down
  1. 1. two girls tricked Conan Doyle into believing in fairies
  2. 3. man who forged the Hitler Diaries between 1981 and 1983
  3. 5. name of the man who created the loch ness monster