The World Expo opened in Osaka on April 13.

S/ NNN Reporter at China Pavilion / A key highlight, sand from the dark side of the moon, is on display. A close look shows that it is black.

At the Osaka Healthcare Pavilion, a visitor tried out the futuristic human washing machine.

S/ Visitor / My skin seems smooth. If this is all it takes, that's great.

Outside the venue, there was a bit of confusion.

S/ Police officer / No parking here. Please proceed.

As the Osaka Expo venue does not have parking space, some drivers tried leaving their car at a nearby convenience store.

Police came to control the situation.

At the expo venue entrance, people formed long lines.

Restaurants on the site were also congested, with some placing admission restrictions.

The Air Self-Defense Force's Blue Impulse aerobatic performance and a demonstration of a flying car were canceled due to rain.

The 185-day expo runs through October 13 on Yumeshima, an artificial island in Osaka Bay, western Japan.