Science and Technology

Science and Technology articles, as requested by a member.


Twenty-five years ago the WWW was born.  A quarter of a century.

Yet there are still times when this modern miracle simply doesn’t work. In the past week we’ve had access for only about 6 hours. 25 years ago, when it all first began this kind of connectivity would have seemed miraculous – now it is just annoying.

A satellite navigation or sat nav system consists of a receiver and a system of satellites that, when combined with a computerized map, can pinpoint an individual or a vehicle's location to within 30 feet.  Most sat navs use the United States NAVSTAR Global Positioning System (GPS), which is made up of around 30 US military satellites orbiting the earth.  They constantly beam high frequency radio signals to earth. Each satellite contains an electronic clock, accurate to 1 second in 138 million years.  

Graphology is the study of handwriting in order to try to infer a person's character. It is a controversial subject and many people consider it a pseudoscience, but rightly or wrongly some companies still use it as part of their hiring strategy.

Genetics is a discipline of biology, the word "genetics" comes from the Ancient Greek word for origin.  It is the science of heredity. This includes the study of genes, and the inheritance of variation and traits of living organisms.[1][2][3]

In the laboratory, genetics can be studied by mating carefully selected organisms, and analysing their offspring. More informally, genetics is the study of how parents pass some of their characteristics to their children. It is an important part of biology, and gives the basic rules on which evolution acts.

Mendel genetis

The fact that living things inherit traits from their parents has been known since prehistoric times, and used to improve crop plants and animals through selective breeding. However, the modern science of genetics, which seeks to understand the process of inheritance, only began with the work of Gregor Mendel in the mid-nineteenth century.[4]

 

 

Although he did not know the physical basis for heredity, Mendel observed that organisms inherit traits via discrete units of inheritance, which are now called genes.

A forum member asked on the forum recently if a container of hot water could freeze faster than a container of cold water.  I had heard on some TV program like QI or Horizon that it could, but I couldn't for the life of me remember how, or why.  A bit of research on the net produced this article, which is republished with permission:-