The behind-the-scenes tales of hit products and creations from Japan: this is Japan's Top Inventions. This time, quartz wristwatches, which caused a "timepiece revolution" with their accurate timing. Built in Japan in 1969, the world's first quartz wristwatch drifted only 0.2 seconds a day, making it about 100 times more accurate than previous watches. Even now, 96% of watches around the world use the same system. We trace the drama behind the creation of this super-accurate timepiece.

The behind-the-scenes tales of hit products and creations from Japan: this is Japan's Top Inventions. This time, the gadget that lets you enjoy music anytime, anywhere with just a pair of headphones: the portable music player. The world's first of these portable players was developed by a Japanese manufacturer in 1979. Listening to music on the go is now a part of daily life around the world. This time, the story of the invention that made it all possible.