Who invented conveyor-belt sushi?

Conveyor-belt sushi was invented by Yoshiaki Shiraishi, who opened the first one in Osaka in 1958 after being inspired by a conveyor belt at a beer factory.

Reference: Smithsonian Magazine

A praying mantis will eat a black widow.

Sushi started as a way to preserve fish by packing it in fermented rice. People ate the fish and threw the rice away.

The cigarette lighter was invented before the match.