The Japanese take body odor very seriously. So much so, in fact, that companies in Japan host seminars on "smell harassment." Impeccable hygiene also extends to the home, where people are expected to take off their shoes upon entering. Naturally, the tech-savvy nation has come up with a number of modern applications for funky-smelling folk. There's an app that tells you if your armpits kick. A female robot that checks for halitosis. And soon, you'll even be able to buy a robotic puppy that smells your feet.