Plaster of Paris:
Plaster of Paris or Gypsum Plaster which is used in making statues and coating of walls. It is also used to fix the dislocated as well as fractured bones as it is dries quickly to acquire the molded shape. It is a good finishing agent rather than a load-bearer. Its chemical name is Calcium Sulfate.
Theodolite:
An instrument used in surveying. It measures horizontal and vertical angles with a small telescope that can move in the horizontal and vertical planes. The measurement is done by pointing it at a target object. The device has a great precision with angles to seconds of arc. Theodolites have been adapted for specialized purposes in fields like metrology and rocket launch technology.
Bird Flu:
Bird Flu or Avian virus refers to an influenza caused by viruses adapted to birds. It seems to effect all of the birds and especially chicken, however only 2 cases were reported to have caused death in human. Moreover, there has been no case since 2003. Despite the fact that the virus has been lethal to other animals it seems that the preventive measures have been effective in curtailing the virus. It is also estimated that the virus is seasonal and may return again in extreme cold weather.
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