A study suggests that the first of seven key pyramids in Egypt, the Step Pyramid of Djoser, was built using a hydraulic lift. Dated to about 4,500 years ago, this would move up the introduction of ...

The arrival of the first 'baby boomers' in the pension system increases enrollments by 12.6%. The reality of the demographic pyramid prevails. And few pieces of evidence are as graphic as the data ...

If there are more children than elderly people, the chart will have the shape of a true pyramid. Take 1950, for example. Here, the post-war baby boom generation is clearly visible. Nowadays, only the ...

If there are more children than elderly people, the chart will have the shape of a true pyramid. Take 1950, for example. Here, the post-war baby boom generation is clearly visible. Nowadays, only the ...