The brain is working at its peak.

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When emergency repairs were carried out to the Kessock Bridge in 2011, flexible working hours were encouraged to avoid peak travel times.

BBC: Skethces

Which is what leads to our interesting problem: the margin for error, the gap between the entire system working at full output and potential peak demand is going to be only 4% of that peak demand.

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In reality, however, by 1960 there were as many women working as there had been at the peak of World War II, and the vast majority of them were married. (Young single adult women were, as we'll see, as rare as female action heroes at this point in history.) More than 30 percent of American wives were holding down jobs, including almost 40 percent of wives with school-age children.

NPR: Excerpt: 'When Everything Changed'

At the peak of the dig, more than 60 archaeologists were working at the site.

CNN: London dig turns up slice of Roman life

Service manager, Kevin Hart, said when working out the route they did not look at traffic levels during peak times.

BBC: Jersey's bus company in timetable blunder

But Mr Montgomery's grand plans have failed to distract investors' attention from the decline of the Mirror, once Britain's great working-class paper, which sold 5.3m copies at its peak 30 years ago and now sells only 2.3m.

ECONOMIST: Reflections on the Mirror

The peak for Royal Mail deliveries was in 2005-06 when some 84 million items were delivered every working day.

BBC: Letter boxes: The red heart of the British streetscape