The numbers for July 23, 2013: Surprising discoveries

23 and 69

The ages when we, humans, are at our happiest, in general, according to a new survey from the London School of Economics. (Time)

$100 billion

The estimated annual cost of cyber crime to the U.S. economy. Sounds big, but the figure is actually one-tenth of previous estimates (Marketplace)

No. 1

Luanda, Angola, ranks as the most expensive city in the world for ex-patriots. The country is Africa’s second largest oil exporter these days and that cash is driving up prices. (Telegraph)