Watch Japan's Top Inventions Season 5 Episode 11 Online

The fascinating stories and secrets behind hit Japanese products, plus parts and machines that boast the top share of niche markets. In the first half: the story behind needles which cause less pain during injection, developed by a Japanese company in 2005. In the second half: sports wheelchairs made by a Japanese company which have helped athletes win over 140 medals in the Paralympic events like tennis and wheelchair racing.