Black History Facts

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Across
  1. 4. Invented the modern traffic light
  2. 5. Pioneered the chemical synthesis of medicinal drugs from plants
  3. 7. The first person to perform a successful open-heart surgery
  4. 8. Pioneered the process of preserving blood for transfusions
Down
  1. 1. Invented the potato chip
  2. 2. Developed the first modern heating system
  3. 3. Improved the design of the lightbulb to make it practical and affordable
  4. 6. Developed the calculation that made GPS accurate
  5. 8. The first self-made female millionaire in the U.S.