For the pilots like Donut, this link to the troops on the ground gives them very direct feedback and satisfaction in their work.

CNN: War stories: Donut in a Warthog

The drywell is a large steel pressure vessel that looks like a giant upside-down pear and holds the reactor and primary pumps, and the wetwell is a large toroidal vessel that looks like a donut.

FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi

"It's like eating a donut, " he said.

CNN: STORY HIGHLIGHTS

It's home to the world's third-largest film industry and serves as a breeding ground for Canto-pop, a treacly transmogrification of Western pop-rock that can leave the listener feeling rather like a glazed donut -- coated in sugar but with a big hole in the middle.

CNN: The Really Useful Guide