This time, our theme is moss. In some countries, it is regarded almost as a weed, but in Japan, it's cherished. Moss can be found in the gardens of temples and shrines, in forests and mountains and even in large cities. Our main guest is Oishi Yoshitaka, an associate professor at Fukui Prefectural University. He introduces us to different species of moss, and explains the role it plays in both the natural world, and in Japanese gardening. And in Plus One, Kanoa makes a beautiful moss terrarium.

Kotatsu are low tables with a heat source underneath, and a blanket draped over the top. For hundreds of years, Japanese have gathered around them in the cold winter months. They're cozy and comfortable; perfect for watching TV, studying and chatting to family and friends. Our guest, architect and university professor Watanabe Shinichi, talks about the social and environmental benefits of Kotatsu. And in Plus One, Kanoa tries out Kotatsu in some unusual locations.