Inventor of elevator doors that open and close

Inventor of products from peanuts like peanut butter, face lotion, and glue

Inventor of the traffic signal

Inventor of the Super Soaker Water Gun

Inventor of the first home security system

Recorded as the first female self-made millionaire; invented the hot comb

Inventor of the fire extinguisher

Inventor of the hand-cranked pencil sharpener