Beans are the longest-cultivated plants. A common name for large plant seeds specifically for human food of family fabaceae (Leguminosae). They are important source of proteins throughout the history until today. Considered as heliotropic plant, beans are unique as the leaves tilt throughout the day to face the sun and folded 'sleep.' Currently there are 40,000 bean varieties in the world with only a fraction is massed produced for regular consumption.