28 days of Black Inventions: Recap

28 days of Black Inventions: Butter Churn

28 days of Black Inventions: Hvac System Designs

28 days of Black Inventions: Perm (Hair Relaxer)

28 days of Black Inventions: Control Unit For The Pacemaker

28 days of Black Inventions: Food Preservation

28 days of Black Inventions: Potato Chip