Drucker was born in 1909 in Vienna -- at the peak of the age of innocence and at the top of Vienna's influence in the world.

FORBES: Our fragile golden age

The hiatus in air travel could be a rehearsal for a post-jet age if the peak oil theory is correct and we are facing a future with insufficient fuel to put into planes.

FORBES: The Icelandic Volcano And Quiet Skies Over London

He found that their output rises rapidly after puberty, reaches its peak during young-adulthood, and then declines with age and the demands of parenthood.

ECONOMIST: Human evolution

This is based on the way the climate behaved about 20, 000 years ago, at the peak of the last ice age, a period when carbon-dioxide concentrations leapt.

FORBES: Climate Change Is Now Less Of a Problem. So We Need To Do Less About Climate Change

Eligible older people are entitled to free off-peak travel on local buses anywhere in England when they reach the state pension age.

BBC: UK

The peak times for outgrowing allergies are when a child hits school age and during the teenage years -- after college, it's unlikely, she said.

CNN: 'Exciting' advance reported in peanut allergy therapy

The city-states of ancient Greece had populations smaller than Iceland's today: Athens, at its peak in the age of Pericles, had perhaps 200, 000 people, slaves included.

ECONOMIST: LITTLE COUNTRIES: Small but perfectly formed | The