Beyond combing through their weapons, French forces are using DNA tests to identify some of the slain Islamist fighters, Fabius said.

CNN: STORY HIGHLIGHTS

Designers at Dyson put their vacuum cleaners through elaborate impact tests, including ramming them into baseboards and table legs some 21, 000 times, at a rate of 30 impacts per minute.

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

But random checks by inspectors were introduced after claims that, in last year's national tests, some teachers opened the envelopes containing the exam papers early and coached their pupils through the questions.

ECONOMIST: Teachers�� pay