A museum in Osaka - the Japanese city hosting the ongoing G20 summit - has been trending online this week for its exhibitions of instant noodles. One of the most popular displays is a tunnel which incorporates about 800 pots. Visitors can actually walk through it and enjoy some special views from the passageway. Japan was the first country to produce this fast snack way back in 1971. And they've taken the world by storm ever since. A survey shows that the Japanese regard them as one of the country's most important inventions of the 20th century.