Japan's Top Inventions - Season 4 Episode 4

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 of the show, the story behind neurosurgical instruments used and loved by surgeons in over 50 countries and regions. In the second half, weather meters, machines which reproduce outdoor conditions like sunlight. They're used to test how products like apparel, cars, housing materials, appliances and more stand up to environmental conditions.