Madame C.J. Walker created hair products for black women and became very close to a millionaire from the sales. (Special photo)Dr. Charles Drew worked with the American Red Cross during WWII and was instrumental in creating the first large-scale blood banks. (Special Photo)Garrett Augustus Morgan created the first “safety hood”. With modifications to carry its own air supply, the gas mask saved many lives during WWI and WWII. (Special Photo)Sarah Boone can be thanked for the invention of the ironing board. (Special Photo)In 1891, Philip B. Downing created a public mailbox that was safe from thieves and protected the mail from rain and snow. (Special Photo)Onesimus, a slave in Boston, told his owner about how inoculations were done in Africa. (Special Photo)Physicist Shirley Jackson paved the way for such telecommunications systems as the touch-tone telephone. (Special Photo)