I know the rough figures about current world population (~ 6.5 billion), China population (~ 1.3 billion), and Hong Kong population (~ 6.9 million). I also know that human babies were born every second. Likewise, there are people passed away every day. However, the following websites can give me a deeper and real feeling about those statistics about human population.

• Population Counter - Country Index — The world’s population according to the U.S. Census Bureau.

  It presents data for the population births and deaths by country. The data was collected since January 1, 2005 and new births and deaths are checked for every two seconds. I don’t know exactly how they can do it, but it gives me a real feeling that people are dying every second and babies are born every second. For example, I can calculate that in Hong Kong there are about 132 births and 113 deaths per day since 2005.

• Worldmapper: The world as you’ve never seen it before — Worldmapper is a collection of world maps, where territories are re-sized on each map according to the subject of interest.

  This website can give you various prospects about human population. To quote a few: population is very weakly related to land area; More children are born each year in Africa than are born in the Americas, all of Europe and Japan put together; In Uganda and Niger half the population is under 15 years old; In Italy, Spain and Japan only 14% of the population are children aged under 15.

• Population Rank order (by CIA - The World Factbook).

  This website presents rank order in population of 238 countries or regions. China comes frst and India second. Hong Kong SAR (special administrative region of China) ranks 100. The website also provides various background information about each countries in the Earth.