The best

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Across
  1. 6. worked for nasa
  2. 7. worked for nasa
  3. 8. made critical contributions to NASA's rocket systems and energy
  4. 10. Jr contributor to the Manhattan Project during World War II
Down
  1. 1. third black woman to earn a PhD in math
  2. 2. building America’s first clock at the age of 24
  3. 3. First African American woman to earn a phd in math
  4. 4. works for nasa
  5. 5. second black person to earn a PhD in math
  6. 9. 9th black person to recieve a phd in math