Shark floor-cleaning devices, owned by Euro-Pro Operating LLC, overhauled the design of its electronic Sonic Duo floor cleaner, set to launch in April, after tests revealed how strenuously some people used it.

WSJ: Cleaning Products Get Stronger Even Though Scrubbers Insist On Using Elbow Grease

First, not only is distributed generation cleaner and more efficient, but to make it work requires elaborate electronic-control systems that will result in the commercialisation of the electronic home and business.

ECONOMIST: Letters