The vagaries of wind and sun—especially in countries without favourable weather—mean that turbines and solar panels generate electricity only part of the time.
Its MBA prepares students for the vagaries of doing business in what Wilfried Vanhonacker, the school's dean, describes as “difficult economies”, such as Russia, China and India.
This nocturnal launch, dictated by the vagaries of celestial mechanics, gave rocket-watchers a rare treat, as the vehicle's white-hot exhaust lit up the countryside for miles around.
One half of its surface— the half which, thanks to the vagaries of orbital mechanics, always faces Earth— is dominated by dark, smooth expanses of ancient, frozen lava known as maria.
I got the second-highest marks in my year for Accountancy 1 and there was no way on earth I was dropping back just because of the vagaries of HMRC's flat rate system.
The biggest share of federal spending is mandatory expenditures on social security, health insurance and the like, which are prescribed by laws and not subject to the vagaries of the annual budget-setting process.