Once it gets through, it secretes an enzyme into the barnacle and then waits for the acid to turn the poor guy into mush.

BBC: An extreme way to see Wales' coast

He described a hypothetical scenario in which self-replicating nanomachines able to break down biological material could run amok, replicating exponentially and turning terrestrial life into mush.

BBC: Nanomachine "factories" could one day sit on a desktop

Commodities may fall into this mush for the time being.

FORBES: Gold Heading To $1,300

It's great that African guitarists are finally connecting, but it would be a shame if the edgy originality of their local styles gets softened into a kind of pan-African mush.

NPR: African Guitarists Have Arrived at a New Style

Climbing into a small tin boat, my guide and I rolled out onto Mush Lake.

BBC: Kluane, Canada (Credit: Parks Canada/Fritz Mueller)