The behind-the-scenes tales of hit products and creations from Japan: this is Japan's Top Inventions. This time, cooling gel sheets, which can be applied to the forehead for cooling relief when you're feeling feverish. These sheets were developed in Japan in 1994, and were inspired by none other than a certain pub dish! The sheets are now sold in some 20 countries and regions, and about 400 million are used per year. Join us as we discover the little-known story behind Japan's cooling gel sheets.

The behind-the-scenes tales of hit products and creations from Japan: this is Japan's Top Inventions. This time, durable timepieces that don't break when dropped: shock resistant wristwatches. These unique watches were created by a Japanese firm in 1983, and are now available in 138 countries and regions. Over 100 million units have been shipped to date. Discover their surprising inspiration -- a child playing with a rubber ball in a park -- and more in the little-known story behind this invention.