Her family is interested in ocean sustainability and planned to visit the Blue Ocean Dome. She said the boys are "super excited to have their photo with the (big Gundam) robot and some of the interesting tech things that are going on."

A small artificial heart made from induced pluripotent stem cells, or iPS, demonstrated a heartbeat at a Japanese healthcare pavilion.

China's highlights include side-by-side displays of lunar soil samples collected by China's Chang'e missions, the Jiaolong deep-sea submersible experience capsule and next-generation humanoid robots.

Agencies Via Xinhua