Falling birth rates are also indicators of better educated and more autonomous women, which is one reason why sub-Saharan Africa's birthrate remains stubbornly high.
In fact, glasses are a poor indication of intelligence because you can have bad eyesight for a number of reasons and then choose to wear contact lenses.
Its Labour market is sharply divided between protected, well-paid insiders and unprotected, temporary workers-one reason why youth unemployment is high.
It's then a good idea to look at what's causing you to want to take drugs and how you can find a way to stop. This will safeguard your mental health for the future.
Twenge and her team make a point of saying that they are not trying to establish causes as such, but that they are assessing the plausibility of potential causes.
In particular, they found cats don't suffer from separation anxiety and any noise they make when their owner leaves is more likely to be out of boredom or frustration.