Years with a larger increase in online usage were followed by years with lower wellbeing, rather than the other way around.

In a study of 33 years of trends in Body Mass Index across 200 countries, the scientists found that people worldwide are getting heavier and that most of the rise is due to gains in BMI in rural areas.

Without partitioning, much overhead is incurred from getting the current data to the right place for processing, and this overhead grows exponentially -- not linearly -- as more machines are added.