African-American scientists have made significant contributions to various fields of science and technology, despite facing systemic barriers and discrimination throughout history. Here are some famous African-American scientists and their accomplishments:

1. George Washington Carver (1864-1943) – an agricultural scientist and inventor who developed hundreds of new uses for crops such as peanuts, sweet potatoes, and soybeans.
2. Benjamin Banneker (1731-1806) – a self-taught astronomer and mathematician who designed and built one of the first clocks in America, and made astronomical observations and predictions.
3. Charles Richard Drew (1904-1950) – a physician and medical researcher who made pioneering contributions to the field of blood transfusion and established the first blood bank in the US.
4. Mae Jemison (1956-present) – an astronaut, physician, and engineer who became the first African-American woman to travel to space in 1992 aboard the Space Shuttle Endeavour.
5. Percy Julian (1899-1975) – a chemist who made groundbreaking contributions to the synthesis of hormones, cortisone, and other steroid drugs, and pioneered the large-scale production of these drugs.
6. Shirley Ann Jackson (1946-present) – a theoretical physicist who made pioneering contributions to the fields of particle physics, solid-state physics, and telecommunications, and served as the first African-American woman to earn a PhD in physics from MIT.
7. Patricia Bath (1942-2019) – an ophthalmologist who was the first African-American female doctor to receive a patent for a medical invention and is known for inventing a new surgical technique for cataract removal.

These African-American scientists have made a lasting impact on their respective fields and helped break down barriers for future generations of scientists and innovators.