Scientists think there are around 20,000 species of seaweed. They include many varieties of kombu, a type of edible kelp. Kombu has been harvested and eaten in Japan since ancient times. It is more than just an essential part of Japanese cooking - it is also a symbol of good fortune. This time on Japanology Plus, we'll explore the part kombu has played in Japanese cuisine and culture for millennia. Our guest is Hajime Yasui, one of the world's leading experts on seaweed. And in Plus One, kombu art!