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The most populated cities in the world
By: C.E. Pierre
In 2009, cities are more important to the global system than ever. Urbanization is spreading, with people moving from villages and farms into towns and cities. It is estimated that half of the world's population now lives in urban areas. The world's largest cities demonstrate...
By: Tim Harry
Jewellery has always been highly sought after, and even when expensive diamonds and precious metals were too costly, cheaper materials were used to replicate the more expensive look. One stone used as a replacement for diamonds was Citrine, a much more common stone, and therefore...
By: Jack Mckeever
When we look into history we see that the planet has advanced in technology a few times to a disastrous end. Life as we knew it on the planet ended to bring about a new and brighter beginning. We look at science and marvel at...
By: Allan Taylor
Citrine is the transparent yellow to orange colored variety of quartz, deriving its name from the Latin, or French “citron” meaning lemon. A better color analogy is with that delightful apertif “sherry”, ranging from fino, Amontillado through to Oloroso. Citrine is found in...
Book reviews: Short History of Nearly Everything, by Bill Bryson
By: Sinan Kahya
The book is written by a professional writer, not by a scientist. Since the author knows how to explain things plainly and in a detailed way, it makes this book much more fun than other science books. There are lot of jokes and funny examples...
Dinosaur extinction and the Chicxulub crater.
By: D. Vogt
It is now generally accepted among paleontologists and geologists that the most likely reason for the extinction of the dinosaurs 65 million years ago, during the so-called Cretaceous-Tertiary extinction event, was an asteroid impact. However, there is still some uncertainty over what precise impact might...
Is Space Travel to the Planet Mars too Dangerous
By: Gunter Chang
Of course travel to Mars, 150 million miles of hard vacuum and cosmic radiation away, is too dangerous and it will probably remain so for the foreseeable future. This question is phrased not, "should we go to Mars", or, "will we ever get to Mars"...
By: Dr Pandula Siribaddana
Asthma is a chronic disease which will affect the airways of the lungs and thereby make a person vulnerable in developing a restrictive lung disease which prevents the person from breathing in adequate amount of air for normal oxygenation. The underlying mechanism of asthma would...
How is taconite mined?
By: Tim Harry
Relatively few people will have ever heard of Taconite, but without it steel production around the world would be devastated. Taconite is one of the main ores of iron. Taconite is a low grade ore when compared to Magnetite and Hematite, and is silica rich...
By: Anne StClair
The list of the most populated cities of course depends on your definition of what a city is and where it ends, and it also depends on where you look for the information. Depending on where you look, you will come up with different lists...

 

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