The diminishing number of Western forces in Helmand is one of the first visible signs that Nato's 13-year involvement in Afghanistan is gradually drawing down, though British commanders are keen to stress that they will do all they can over what they term an "important summer" to ensure the Afghan army and police are ready to take on the fight.

BBC: UK troops prepare for Helmand tour

When companies are under economic stress, line extensions may become an attractive way to keep revenue flowing, drawing resources away from innovative, more important work.

WSJ: Should Patents on Pharmaceuticals Be Extended to Encourage Innovation?

By repeatedly drawing energy out and pouring it back in every ten minutes, they want to know how much stress the batteries can handle.

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