(Thanks to all websites)
Virus:
http://en.wikipedia.org/wiki/Virus
They are at the periphery of living and non living things?
It is a fact that they show living characteristics, and they also show some non living characteristics.
E.g. They suffer from diseases and show living characteristics. On the other hand they show non-living characteristics as they can be crystallised.
See today's news:
http://www.telegraph.co.uk/earth/main.jhtml?xml=/earth/2008/08/06/scivirus106.xml
They suffer:
