Princess Kako paid an online visit to the 53rd 'Naruhodo-Ten' exhibition at Tokyo Kotsu Kaikan. Japan Women Inventors Association (JWIA) sponsors the exhibition that features winners of an invention contest focused on daily life. These inventors are all housewives and many of them are above retirement age. The government has designated April 18 as Inventor's Day and each year the women's association holds an exhibition consisting of its members' latest creations.